Complex sentence: He then came to Italy, appearing at the Teatro San Carlo in Naples, and La Fenice in Venice, and made his debut at La Scala in Milan in 1948, as Renato in "Un ballo in maschera".
Split into simpler sentences: He then came to Italy, appearing at the Teatro San Carlo in Naples, and La Fenice in Venice. He made his debut at La Scala in Milan in 1948, as Renato in "Un ballo in maschera".