anyone know software to split a text file

You could write a small script to do this , but if it's just one text file I'd just do it manually. Look up TextWrangler, it has a "Find" feature you can use.

 

What format is the file currently in? Text file could be plain text, rich text, MS Word, etc.

For plain text, if you're not afraid of the command line you can look at the csplit command (do man csplit for info), or if you want to get really geeky, I'm sure awk can do it.

Example of csplit

Code:

csplit -f Chapter_ -ks book.txt '/^Chapter/' {25}

The 25 at the end designates how many chapters there are. You can set it higher than you need to be sure it gets them all, though it will output an error message in Terminal, but all of the files will be split.