Complex sentence: The family moves to New England during the 1970s as their future is threatened by Bill's declining health, Marcella's alcoholism, and the struggles of Channe and Billy to adapt to American high school.
Split into simpler sentences: The family moves to New England during the 1970s. Their future is threatened by Bill's declining health, Marcella's alcoholism, and the struggles of Channe and Billy to adapt to American high school.