Complex sentence: He received his Ph.D. in physics from the University of California, Berkeley in 1966 under the supervision of Geoffrey Chew and was a Junior Fellow at Harvard University and a Professor at Princeton University until 1997.
Split into simpler sentences: He received his Ph.D. in physics from the University of California, Berkeley in 1966 under the supervision of Geoffrey Chew. He was a Junior Fellow at Harvard University and a Professor at Princeton University until 1997.