Complex sentence: Barry's truck stalls after the military men accidentally kill the zombie powering it, in an attempt to shoot the protagonists; while taking a pit stop for Brooke to fetch them a zombie, Benny is shot in the stomach.
Split into simpler sentences: Barry's truck stalls after the soldiers accidentally kill the zombie powering it. While taking a pit stop for Brooke to fetch them a zombie, Benny is shot in the stomach.