Complex sentence: Anthony and John Paul attend the party, but are racked with guilt, and return home to their mother, unaware she has seen them entering Eva's house, and states that the three of them will be moving away from Springhill after all.
Split into simpler sentences: Anthony and John Paul attend the party, but are racked with guilt, and return home to their mother, unaware she has seen them entering Eva's house. On their return Liz states that the three of them will be moving away from Springhill after all.