Can someone explain to me what a sub claim is and give me an example

Question

All I can find is that it is a part, or claim on an argument.

Example:
Bob Pursley is growing senile.....arguement
He eats unpeeled bananas sub claim
He does not look back when backing..subclaim
He cant keep up with his wallet or car keys...subclaim
http://web.grinnell.edu/courses/HIS/f05/his202-01/Research_Paper/FinalAsn.html

Good example Bob. That was some funny suff, but it made me understand. Thanks:)