Complex sentence: Kevin comes out of the shower and finds a knife with blood all over it; picks up the knife and looks over at the bed and sees Joanne dead while someone at the apartment comes in and sees him holding the murder weapon.
Split into simpler sentences: Kevin comes out of the shower and finds a knife with blood all over it. He picks up the knife, looks over at the bed and sees Joanne dead while someone at the apartment comes in and sees him holding the murder weapon.