Complex sentence: William Cowper Prime (1825--1905) was an American journalist, art historian, numismatist, and travel writer, younger brother of S. I. Prime and E. D. G. Prime, born at Cambridge, New York.
Split into simpler sentences: William Cowper Prime (1825--1905) was an American journalist, art historian, numismatist, and travel writer. William Prime was the younger brother of S. I. Prime and E. D. G. Prime, born at Cambridge, New York.