Complex sentence: In 1957, he left Taiwan for the United States, where he received a doctorate in physics from the University of Maryland in 1961 before going on to teach at Princeton University and Purdue University as well as taking up a position at NASA.
Split into simpler sentences: In 1957, he left Taiwan for the United States, to enroll in a doctoral program in physics from the University of Maryland, from which he graduated in 1961. He went on teach at Princeton University and Purdue University as well as taking up a position at NASA.