Complex sentence: On Tuesday afternoon, August 19,1958, Clara Luper and a group of Youth Council members entered the segregated Katz drugstore in downtown Oklahoma City, took seats, and asked to be served.
Split into simpler sentences: On Tuesday afternoon, August 19,1958, Luper and a group of Youth Council members entered the segregated Katz drugstore in downtown Oklahoma City. They took seats, and asked to be served.