If you want to divide it, gently separate it into two parts. You can do this with your fingers, just concentrate on the center of the ball and squeeze/pull-apart 'till you have two parts. You can take a pair of scissors and just sever the ball into two parts also. Then "just kind a form the parts into balls" and let nature take it course in gettin' 'em goin' again
I usually don't to this until they are pretty close to tennis ball size, but I guess you can do it before then ...
Regards,
JS