Complex sentence: He wrote most of the music for the French musical and rock opera, "La Révolution Française", France's first rock opera, in 1973, and also played the role of King Louis XVI in the show's production that year.
Split into simpler sentences: He wrote most of the music for the French musical and rock opera "La Révolution Française", France's first rock opera, in 1973. He played the role of King Louis XVI in the show's production that year.