Original sentence: Dalton Trumbo (December 9, 1905 - September 10, 1976) was an American screenwriter and novelist, and a member of the Hollywood Ten, one of  group of film professionals who refused to testify before the 1947 House Un-American Activities Committee about alleged communist involvement
Edited sentence: Dalton Trumbo (December 9, 1905 - September 10, 1976) was an American screenwriter and novelist who was probably the most talented member of the Hollywood Ten, one of a group who refused to testify before the 1947 House Un-American Activities Committee about alleged communist involvement