Complex sentence: Pete Thornton arrives on the scene with the police chief where, after not getting much from the distraught Tony, they interrogate Marcy's mother who can only tell Pete that her daughter belonged to a book club.
Split into simpler sentences: Pete Thornton arrives on the scene with the police chief. After failing to obtain any useful information from the distraught Tony, they interrogate Marcy's mother, who can only tell Pete that her daughter belonged to a book club.