Original sentence: Due to the years of racial discrimination in the entertainment world, Markham had almost exclusively performed on the "chitlin' circuit" of vaudeville, theatres, and night clubs and appeared in several race films; thus, he was not widely known by white audiences
Edited sentence: Alexander's 1949 revue film Burlesque in Harlem, which documented the chitlin' circuit.Due to the years of racial discrimination in the entertainment world, he was not widely known by white audiences, and had almost exclusively performed on the "chitlin' circuit" of vaudeville, theatres, and night clubs and appeared in several race films, including William D