Complex sentence: Jess and Phyll receive another obscene phone call that quotes apart of the argument between Peter and Jess, and suspect it is Peter, however, they remember that Peter was inside the house during one of the calls.
Split into simpler sentences: Jess and Phyll receive another obscene phone call that quotes part of the argument between Peter and Jess, and they suspect it is Peter. However, they remember that Peter was inside the house during one of the calls.