Simplify the following text for a Grade 9 native English-speaking person.
Original: Sir Jacob Epstein KBE ( 10 November 1880 - 19 August 1959 ) was an American-born British sculptor who helped pioneer modern sculpture .
Simplified: Sir Jacob Epstein KBE ( 10 November 1880 - 19 August 1959 ) was an American-born British sculptor , a pioneer of modern sculpture .