Complex sentence: Garten earned his B.A. from Dartmouth College in 1968 and an M.A. (1972) and Ph.D. (1980) from the Johns Hopkins University's School of Advanced International Studies.
Split into simpler sentences: Garten earned his B.A. from Dartmouth College in 1968 and an M.A. in 1972 from Johns Hopkins University. In 1980, he received a Ph.D. from Johns Hopkins University's School of Advanced International Studies.