Complex sentence: She sang Eva with pleasure in Wagner's "Die Meistersinger von Nürnberg" at the Bayreuth Festival in 1952, but she was never to sing the Bayreuth Festival again, preferring the summer Salzburg Festival.
Split into simpler sentences: She sang Eva in Wagner's "Die Meistersinger von Nürnberg" at the Bayreuth Festival in 1952. She was never to sing the Bayreuth Festival again, preferring the summer Salzburg Festival.