Complex sentence: Rudy, Cesar's personal assistant, shows up and kills the deputy mayor and is about to kill Eva since she's deemed as a nuisance, when Shank dives in front of her and kills him.
Split into simpler sentences: Rudy, Cesar's personal assistant, shows up and kills the deputy mayor, threatening to kill Eva since she's deemed as a nuisance. Shank quickly dives in front of her and kills him.