Complex sentence: Thomas B. Fitzpatrick (1919--2003) was a Chairman of the Department of Dermatology at Harvard Medical School and Chief of the Massachusetts General Hospital Dermatology Service from 1959 to 1987.
Split into simpler sentences: Thomas B. Fitzpatrick (1919--2003) was an American dermatologist. He was Chairman of the Department of Dermatology at Harvard Medical School and Chief of the Massachusetts General Hospital Dermatology Service from 1959 to 1987.