Complex sentence: Sherriff Pangborn returns from meeting with Brian and is now very suspicious of Gaunt, he tries to warn Polly and asks her to get rid of the necklace, but she is unwilling to remove it.
Split into simpler sentences: Sherriff Pangborn returns from meeting with Brian and is now very suspicious of Gaunt. He tries to warn Polly and asks her to get rid of the necklace, but she is unwilling to remove it.