Complex sentence: Fred Bunche is believed to have had Bunch and other ancestors who were established as free people of color in Virginia before the American Revolution and in South Carolina by the end of the 18th century.
Split into simpler sentences: Fred Bunche is believed to have been from South Carolina and to be a descendant of the Bunch family established as free people of color in Virginia before the American Revolution. There were men of the Bunch surname in South Carolina by the end of the 18th century.