Complex sentence: Billy Joseph Mayerl (May 31,1902-March 25,1959), was a pianist and composer who built a career in music hall and music theatre and became an acknowledged master of light music.
Split into simpler sentences: Billy Joseph Mayerl (May 31,1902-March 25,1959), composer. He was a pianist and composer who built a career in music hall and music theatre and became an acknowledged master of light music.