Then why don't you show us the link to the Windows software, that can do this, and maybe someone will recognize that program and know of a Mac OS X equivalent.
you can split/cut/trim your video automatically by size, time or number of pieces and manually by selecting the beginning and ending points of the needed segments.
Ah, using a search engine can sometimes help as it seems.
I used the terms "mac os x split movies", got a thread (1st result) with a link (last post) to the following: http://likelysoft.com/splitfuse/ .
Have fun splitting.