Complex sentence: Teenage heartthrob Scott Baio starred in this short-lived spin-off from Happy Days, which saw Fonzie's young cousin move to Chicago, with his mother, Louisa, and stepfather, Al, and try to start a singing career.
Split into simpler sentences: Teenage heartthrob Scott Baio starred in this short-lived spin-off from "Happy Days". It saw Fonzie's young cousin move to Chicago, with his mother, Louisa, and stepfather, Al, and try to start a singing career.