Авторская раздача: WorkAudioBook (аудио-плеер для изучающих иностранный язык / audio player) 4.3 x86 х64 [2015, ENG, RUS]

..
using io = System.IO;
..
static void _break_long_lines(string sz_file_descr, string[] ss_cont_descr)
{
string sz_line, sz_part_sep;
string[] ss_line, ss_line_2;
// maximal allowed line length in characters:
const int LINE_MAX_LEN = 125;
// minimal allowed phrase part length in words count:
const int LINE_MIN_WORD_CNT = 4;
for (int ii_line = 0; ii_line < ss_cont_descr.Length; ii_line++)
{
  sz_line = ss_cont_descr[ii_line];
  if (sz_line.Length < LINE_MAX_LEN)
  { // line is short enough:
   io.File.AppendAllText(sz_file_descr, (io.File.Exists(sz_file_descr) ? Environment.NewLine : "") + sz_line.Trim());
  }
  else
  {
   ss_line = sz_line.Split();
   bool broken = false; // just flag to mark success
   bool allow_lower = false; // next word should start with uppercase or have not
   int line_part_len = 0, move_dir = 1, line_middle = ss_line.Length / 2, move_idx;
   sz_part_sep = "."; // initial line breaker
  again_sep:
   // we always try to break even every given line, so we always try to go from the middle point
   for (int ii_line_part = 0; ii_line_part < line_middle; ii_line_part++)
   {
    move_dir = 1; // start with forward direction
   again_dir: // to change direction for the same separator:
    move_idx = line_middle + ii_line_part * move_dir;
    line_part_len += ss_line[move_idx].Length;
    if (ss_line[move_idx].ToLower() != "u.s." &&
     !ss_line[move_idx].ToLower().EndsWith(" mr.") &&
     !ss_line[move_idx].ToLower().EndsWith(" mrs.") &&
     ((ss_line[move_idx].EndsWith(sz_part_sep) ||
     ss_line[move_idx].EndsWith(sz_part_sep + "\"")) &&
     !ss_line[move_idx].StartsWith("\"")) &&
     // probably we should somehow calculate the length of phrase part broken:
     // line_part_len > LINE_MIN_LEN &&
     // .. but it seems to be Ok enough to count only words,
     // and allow only certain minimal requred words count,
     // with this below following two lines:
     LINE_MIN_WORD_CNT < ss_line.Length - move_idx &&
     LINE_MIN_WORD_CNT < move_idx &&
     ((char.IsUpper(ss_line[move_idx + 1][0]) || allow_lower) || ss_line[move_idx + 1][0] == '"')
     )
    {
     ss_line[move_idx] += Environment.NewLine;
     line_part_len = 0;
     broken = true;
     break;
    }
    if (broken == false)
    // have had no luck (otherwise the loop exits anyway, and actualy conditioning on "broken" is not required)
    {
     if (move_dir == 1)
     { // lets try our luck with backward direction, with the same shift:
      move_dir = -1;
      goto again_dir;
     }
     else
     {
      // nothing to do, lets proceed to the next shift/positioning from the line middle
     }
    }
   }
   ss_line_2 = string.Join(" ", ss_line).Replace(Environment.NewLine + " ", Environment.NewLine).Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
   if (ss_line_2.Length > 1)
   { // we are recursive, here we shold be broken for exactly two lines,
    // if still too long the recursive part will take care for it again:
    _break_long_lines(sz_file_descr, ss_line_2);
   }
   else
   {
    // lets try break by dots
    if (sz_part_sep == ".") { sz_part_sep = "!"; allow_lower = false; goto again_sep; }
    // no dots, lets try break by exclamations
    if (sz_part_sep == "!") { sz_part_sep = "?"; allow_lower = false; goto again_sep; }
    // no exclamations, lets try break by questions
    if (sz_part_sep == "?") { sz_part_sep = ","; allow_lower = true; goto again_sep; }
    // no questions, lets try break by commas
    if (sz_part_sep == ",") {
     // no commas also :(, so lets just write the line as it is:
     io.File.AppendAllText(sz_file_descr, (io.File.Exists(sz_file_descr) ? Environment.NewLine : "") + sz_line.Trim());
    }
   }
  }
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using io = System.IO;
namespace ConsoleApplication1
{
class Program
{
  static void Main(string[] args)
  {
   // first scenario, probably better for test purposes
   // input string array:
   string[] ss_text_test_1 = new string[] {
    // string to process:
    "\"How many times did mister Trump ask you to threaten an individual or entity on his behalf?\" Cohen told Congresswoman Jackie Speier quite a few. \"Fifty times?\" \"More.\" \"A hundred times?\" \"More\". \"Two hundred times?\" \"More.\" \"Five hundred times?\" \"Probably.\"",
    "In another incident, 53 migrants who left Morocco in a dinghy were reported missing after what a survivor said was a collision in the western Mediterranean."
   };
   _break_long_lines(
    // where to save processed strings:
    "c:\\aaa\\bbb\\ccc.txt",
    // input string array:
    ss_text_test_1);
   // SECOND SCENARIO
   string sz_orig_file_path = "c:\\aaa\\bbb\\orig.txt";
   string sz_dest_file_path = "c:\\aaa\\bbb\\fixed.txt";
   // input string array read from disk file:
   string[] ss_text_test_2 = io.File.ReadAllLines(sz_orig_file_path);
   _break_long_lines(
    // where to save processed strings:
    sz_dest_file_path,
    // input string array:
    ss_text_test_2);
  }
  static void _break_long_lines(string sz_file_descr, string[] ss_cont_descr)
  {
   string sz_line, sz_part_sep;
   string[] ss_line, ss_line_2;
   // maximal allowed line length in characters:
   const int LINE_MAX_LEN = 50;
   // minimal allowed phrase part length in words count:
   const int LINE_MIN_WORD_CNT = 4;
   for (int ii_line = 0; ii_line < ss_cont_descr.Length; ii_line++)
   {
    sz_line = ss_cont_descr[ii_line];
    if (sz_line.Length < LINE_MAX_LEN)
    { // line is short enough:
     io.File.AppendAllText(sz_file_descr, (io.File.Exists(sz_file_descr) ? Environment.NewLine : "") + sz_line.Trim());
    }
    else
    {
     ss_line = sz_line.Split();
     bool broken = false; // just flag to mark success
     bool allow_lower = false; // next word should start with uppercase or have not
     int line_part_len = 0, move_dir = 1, line_middle = ss_line.Length / 2, move_idx;
     sz_part_sep = "."; // initial line breaker
    again_sep:
     // we always try to break even every given line, so we always try to go from the middle point
     for (int ii_line_part = 0; ii_line_part < line_middle; ii_line_part++)
     {
      move_dir = 1; // start with forward direction
     again_dir: // to change direction for the same separator:
      move_idx = line_middle + ii_line_part * move_dir;
      line_part_len += ss_line[move_idx].Length;
      if (ss_line[move_idx].ToLower() != "u.s." &&
       !ss_line[move_idx].ToLower().EndsWith(" mr.") &&
       !ss_line[move_idx].ToLower().EndsWith(" mrs.") &&
       ((ss_line[move_idx].EndsWith(sz_part_sep) ||
       ss_line[move_idx].EndsWith(sz_part_sep + "\"")) &&
       !ss_line[move_idx].StartsWith("\"")) &&
       // probably we should somehow calculate the length of phrase part broken:
       // line_part_len > LINE_MIN_LEN &&
       // .. but it seems to be Ok enough to count only words,
       // and allow only certain minimal requred words count,
       // with this below following two lines:
       LINE_MIN_WORD_CNT < ss_line.Length - move_idx &&
       LINE_MIN_WORD_CNT < move_idx &&
       ((char.IsUpper(ss_line[move_idx + 1][0]) || allow_lower) || ss_line[move_idx + 1][0] == '"')
       )
      {
       ss_line[move_idx] += Environment.NewLine;
       line_part_len = 0;
       broken = true;
       break;
      }
      if (broken == false)
      // have had no luck (otherwise the loop exits anyway, and actualy conditioning on "broken" is not required)
      {
       if (move_dir == 1)
       { // lets try our luck with backward direction, with the same shift:
        move_dir = -1;
        goto again_dir;
       }
       else
       {
        // nothing to do, lets proceed to the next shift/positioning from the line middle
       }
      }
     }
     ss_line_2 = string.Join(" ", ss_line).Replace(Environment.NewLine + " ", Environment.NewLine).Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
     if (ss_line_2.Length > 1)
     { // we are recursive, here we shold be broken for exactly two lines,
      // if still too long the recursive part will take care for it again:
      _break_long_lines(sz_file_descr, ss_line_2);
     }
     else
     {
      // lets try break by dots
      if (sz_part_sep == ".") { sz_part_sep = "!"; allow_lower = false; goto again_sep; }
      // no dots, lets try break by exclamations
      if (sz_part_sep == "!") { sz_part_sep = "?"; allow_lower = false; goto again_sep; }
      // no exclamations, lets try break by questions
      if (sz_part_sep == "?") { sz_part_sep = ","; allow_lower = true; goto again_sep; }
      // no questions, lets try break by commas
      if (sz_part_sep == ",")
      {
       // no commas also :(, so lets just write the line as it is:
       io.File.AppendAllText(sz_file_descr, (io.File.Exists(sz_file_descr) ? Environment.NewLine : "") + sz_line.Trim());
      }
     }
    }
   }
  }
}
}