Complex sentence: He completed his Ph.D in 1969 and has taught at numerous universities such as University of Virginia, the Universities of California Riverside and San Diego and has been a visiting professor at Chicago, Harvard, Cambridge as well as various schools in Europe, Japan and China.
Split into simpler sentences: He completed his Ph.D. in 1969 and has taught at numerous universities such as University of Virginia, the Universities of California Riverside and San Diego. He has been a visiting professor at Chicago, Harvard, and Cambridge, as well as various schools in Europe, Japan and China.