Complex sentence: Vic returns to Castle Rock after several failed attempts to contact Donna and learns from the police that Steve Kemp, the man with whom Donna was having an affair, is suspected of ransacking his home and possibly kidnapping Donna and Tad.
Split into simpler sentences: Vic returns to Castle Rock after several failed attempts to contact Donna. He also learns from the police that Steve Kemp, the man with whom Donna was having an affair, is suspected of ransacking his home and possibly kidnapping Donna and Tad.