Complex sentence: Sheila Harms (May 29,1931--December 12,2004) had an important career in Germany and Austria as a soprano who specialized in the vocal interpretation of Lieder, Oratorio, and Opera, which she combined with her musicianship at the piano.
Split into simpler sentences: Sheila Harms (May 29,1931--December 12,2004) was a soprano in Germany and Austria. She specialized in the vocal interpretations of Lieder, Oratorio, and Opera, which she combined with her musicianship at the piano.