Complex sentence: She was Brangäne when Birgit Nilsson sang her Tristan and Isodle at the Metropolitan 1959, and Amneris when Leontyne Price sang her first "Aïda" at the Metropolitan, on February 20,1961.
Split into simpler sentences: She was Brangäne when Birgit Nilsson sang her Tristan and Isodle at the Metropolitan 1959. And Amneris when Leontyne Price sang her first "Aïda" at the Metropolitan, on February 20,1961.