Original: He went on to earn a master's degree in experimental psychology in 1976, and a Ph.. D in clinical psychology in 1979 at the University of North Texas, where his dissertation was titled "Rheumatoid Arthritis: A Psychological Intervention".
Simplified: He then got a Ph.. D in clinical psychology in 1979 at the University of North Texas. At the University of North Texas, his dissertation was titled "Rheumatoid Arthritis: A Psychological Intervention."