Complex sentence: Walter Hamor Piston Jr, (January 20,1894--November 12,1976), was an American composer of classical music, music theorist and professor of music at Harvard University whose students included Leroy Anderson, Leonard Bernstein and Elliott Carter.
Split into simpler sentences: Walter Hamor Piston Jr, (January 20,1894--November 12,1976), was an American composer of classical music, music theorist, and professor of music at Harvard University. His students included Leroy Anderson, Leonard Bernstein and Elliott Carter.