You can easily split an MP3 with cuesheet in foobar by simply loading the cuesheet and using Converter. However, this will re-encode the MP3s, which I suspect you don't want.
If you search this forum for "mp3 cuesheet" you will probably turn up various threads with links to various software.
I would recommend
pcutmp3.
Edit: There's another active thread about this very topic:
http://www.hydrogenaudio.org/forums/index....showtopic=51399