Complex sentence: His published organ works include many fugues, voluntaries, 90 interludes, and several variations on popular airs; he also wrote variations for piano, and many anthems, hymns, and sacred songs.
Split into simpler sentences: His published organ works include many fugues, voluntaries, ninety interludes, and several variations on popular airs. He also wrote variations for piano and many anthems, hymns, and sacred songs.