Complex sentence: He is a former Professor of Applied Mathematics and Computer Science at Moscow State University and received Ph.D.s in Mathematics and Computer Science 1986 and Doctor of Science 1990 from that institution.
Split into simpler sentences: He is a former Professor of Applied Mathematics and Computer Science at Moscow State University. He received Ph.D.s in Mathematics and Computer Science in 1986 and a Doctor of Science in 1990 from that institution.