Complex sentence: The men tell the police that the delivery man killed himself because he was a psychopath who had been forced to have sex with his mother, and illustrate this by showing the police Ike's drawing, which they say they found in the man's pocket.
Split into simpler sentences: The men tell the police that the delivery man killed himself because he was a psychopath who had been forced to have sex with his mother. They purportedly illustrate this by showing the police Ike's drawing, which they say they found in the man's pocket.