If you have WinAmp and CoolEditPro, it's quite easy to do.
What you do:
1. Open the MP3 in Winamp, set in the Winamp options menu that you want the "Diskwriter" as output, instead of your soundcard. Now, Winamp won't play the song, but it will write it as a WAV file to the harddrive (yes, some softwares can edit MP3 songs, but editing them in WAV mode works a lot better).
2. Now you can open the long track in CoolEdit. Start at the end of the file, look for where the last track starts, cut that part into a new song, save it and start this over again, until there's only one track left.
3. Now you have a set of tracks which can be burned to CDDA.