Complex sentence: He made his Italian operatic début as Masetto in Parma in 1950; and later sang Don Magnifico in "La Cenerentola" in Rome in 1955, and Bartolo in "The Barber of Seville" in Venice in 1956.
Split into simpler sentences: He made his Italian operatic début as Masetto in Parma in 1950. Later, he sang Don Magnifico in "La Cenerentola" in Rome in 1955 and Bartolo in "Barber" in Venice in 1956.