Complex sentence: After World War II, Zinn attended New York University on the GI Bill, graduating with a B.A. in 1951 at Columbia University, where he earned an M.A. (1952) and a Ph.D. in history with a minor in political science (1958).
Split into simpler sentences: After World War II, Zinn attended New York University on the GI Bill, graduating with a B.A. in 1951. At Columbia University, he later earned an M.A. (1952) and a Ph.D. in history with a minor in political science (1958).