Complex sentence: His son, Henry Draper, and his granddaughter, Antonia Maury, were astronomers, her younger sister, Carlotta Maury was a paleontologist, and his eldest son, John Christopher Draper, was a chemist.
Split into simpler sentences: His son, Henry Draper, and his granddaughter, Antonia Maury, were astronomers. Draper's eldest son, John Christopher Draper, was a chemist.