Complex sentence: Gale earned a Ph.D. in Physics from Kansas State University in 1972, and served as a tenured Associate Professor of Physics at East Texas State University for eight years, during which time his research interests shifted to computer science.
Split into simpler sentences: Gale earned a Ph.D. in Physics from Kansas State University in 1972. Gale served as a tenured Associate Professor of Physics at East Texas State University for eight years, during which time his research interests shifted to computer science.