Complex sentence: Kitaoka received his Ph.D. from the University of Tokyo in 1976 and took a lecturership at Rikkyo University; he became a full professor there in 1985.
Split into simpler sentences: Kitaoka received his Ph.D. from the University of Tokyo in 1976. Kitaoka took a lecturership at Rikkyo University; he became a full professor there in 1985.