Original sentence: It shows that after his younger sister Angelina is murdered by her boyfriend Seth Baxter, Hoffman became vengeful and kills Seth by making his death appear like a Jigsaw murder, so as not to incriminate himself
Edited sentence: He makes Seth's death appear like a Jigsaw murder, so as not to incriminate himself.It shows that after his younger sister Angelina is murdered by her boyfriend Seth Baxter, Hoffman became vengeful and kills Seth