Complex sentence: Buddy shouts for help, & is heard by none other than his brontosaurus friend from earlier: the approaching dinosaur scares off all of the cavemen, some of whom are further picked up by the great beast & thrown off-screen.
Split into simpler sentences: Buddy shouts for help, and is heard by none other than his brontosaurus friend from earlier. The approaching dinosaur scares off all of the cavemen, some of whom are further picked up by the great beast and thrown off-screen.