Complex sentence: He was a principal artist with the Chicago Opera Association and the Chicago Civic Opera from 1918-1932, and from 1933-1950 was a leading bass at the Metropolitan Opera in New York City.
Split into simpler sentences: He was a principal artist with the Chicago Opera Association and the Chicago Civic Opera from 1918-1932. From 1933-1950 Lazzari was a leading bass at the Metropolitan Opera in New York City.