Complex sentence: In a pivotal incident, Jigsaw beat Russo for letting a cat inside their house before pulling a gun on his mother and telling him that if he did not drown the cat he (Jigsaw) would shoot her.
Split into simpler sentences: In a pivotal incident, Jigsaw beat Russo for letting a cat inside their house. He then pulled a gun on Russo's mother and told him that if he did not drown the cat he (Jigsaw) would shoot her.