Complex sentence: He attended George W. Julian Elementary during grade school, and attended Shortridge High School, and became a member of its student council along with such prominent figures as Madelyn Pugh and Kurt Vonnegut Jr.; he graduated in 1939 at the age of seventeen.
Split into simpler sentences: He attended George W. Julian Elementary during grade school, and attended Shortridge High School in his teens. He became a member of its student council along with such prominent figures as Madelyn Pugh and Kurt Vonnegut Jr.; he graduated in 1939 at the age of seventeen.