Complex sentence: Finally, Jake admits at least some of his infidelities under heated interrogation by Jo, and, after venting her frustration by furiously assaulting him, she retaliates by having an affair with her second husband.
Split into simpler sentences: Finally, Jake admits some of his infidelities under heated interrogation by Jo. After venting her frustration by furiously assaulting him, she retaliates by having an affair with her second husband.