Complex sentence: In the late 1950s, Watts and Oklahoma State Senator Gene Stipe entered a restaurant, when a waitress stopped them at the door and told them that the restaurant did not serve Negroes, "Watts replied," I don't eat Negroes.
Split into simpler sentences: In the late 1950s, Watts and Oklahoma State Senator Gene Stipe entered a restaurant. When a waitress stopped them at the door and told them that the restaurant (did) not serve Negroes, "Watts replied," I don't eat Negroes.