I think that 'split'split is you best approach.
Try using the '-l xxxx'-l xxxx option, where xxxx is the number of lines you want in each file (default is 1000).
You can use the '-n yy'-n yy option if you are more concerned about the amount of files created. Use '-n 2'-n 2 will split your file in only 2 parts, no matter the amount of lines in each file.
You can count the amount of lines in your file with 'wc -l filename' wc -l filename. This is the 'wordcount' command with the lines option.
Source: man split
References
Source: man wc
man splitman wc