Complex sentence: His father, Emil von Grofé, was a baritone who sang mainly light opera; his mother, Elsa Johanna Bierlich von Grofé, a professional cellist, was also a versatile music teacher who taught Ferde to play the violin and piano.
Split into simpler sentences: His father, Emil von Grofé, was a baritone who sang mainly light opera and his mother, Elsa Johanna von Grofé, was a professional cellist. She was also a versatile music teacher who taught Ferde to play the violin and piano.