Complex sentence: The genre began in the fifties, and had its peak of production in the sixties; according to film critic Stefano Della Casa the name "musicarello" is a reference to the successful Carosello.
Split into simpler sentences: The genre began in the fifties, and had its peak of production in the sixties. According to film critic Stefano Della Casa, the name "musicarello" is a reference to the successful Carosello.