iMac Video Editing Software?

Hey. My brother just recently purchased a camerea with a FireWire attatchment that only plugs into the 1 mac of 4 windows we have and the software on the mac is quite difficult to use. iMovie doesn’t seem to work the way i want it to. I’m trying to pull all of the video off of the camera and then slice it up into different files so i can bring it over to windows. Or just plainly put it in one big file and then bring it over to windows.

Anyone know how to do this or can show me some easier software I can use?