Complex sentence: Florence Gillam Birdwell is an American educator, musician, and singer, who has taught musical theater and opera singing to thousands of voice students over a six-decade career, continuing today as professor of voice at the Bass School of Music at Oklahoma City University.
Split into simpler sentences: Florence Gillam Birdwell is an American educator, musician, and singer. She is currently professor of voice at the Bass School of Music at Oklahoma City University.