As people said, you should be able to use Movie Maker or iMovie. Personally, I use Sony Vegas, which can be very expensive. It's not the most top-notch, but it's up there and it's been my choice for many years now. If you find that you're completely unable to split this .mov I should be able to help you out, and perhaps even up the quality and compress the size of the files. I know I'm essentially nobody on this forum, but remember.