Complex sentence: In 1984, the Music Center Opera Association hired Peter Hemmings and gave him the task of creating a local opera company which would once again present its own productions, and this led to the forming of the Los Angeles Opera.
Split into simpler sentences: In 1984, the Music Center Opera Association hired Peter Hemmings and gave him the task of creating a local opera company which would once again present its own productions. This led to the forming of the Los Angeles Opera.