If you need to split an SQL file into smaller chunks, I found this little utility called sqlsplitter that will do exactly that. You can download it from http://rodo.nl/index.php?page=mysql-splitter.

Pretty simple use, stick your SQL file into a directory along with the executable and then run:

sqlsplitter your-sql-filename.sql 5000000

Where 5000000 is the number of bytes you want to split files into.