Complex sentence: As Burt skims through the book, Vicky is surrounded and attacked by Malachai and several other boys (directed from a rooftop by Isaac) and manages to kill one of them with Burt's shotgun before Malachai stabs her.
Split into simpler sentences: As Burt skims through the book, Vicky is surrounded and attacked by Malachai and several other boys (directed from a rooftop by Isaac). She manages to kill one of them with Burt's shotgun before Malachai stabs her.