Complex sentence: Hess was best known in Wolfgang Amadeus Mozart, Ludwig van Beethoven and Robert Schumann, but had a wide repertoire ranging from Domenico Scarlatti to contemporary works--she gave the premiere of both the piano sonata and piano concerto by Howard Ferguson.
Split into simpler sentences: Hess was best known in Mozart, Beethoven and Schumann, but had a wide repertoire ranging from Domenico Scarlatti to contemporary works. She gave the premiere of both the piano sonata and piano concerto by Howard Ferguson.