Complex sentence: He graduated from the medical college of Seoul National University in 1979, where he received his M.D. and Ph.D. After a residency in the department of obstetrics and gynecology at the same college he joined the faculty there from 1988 until the present.
Split into simpler sentences: He graduated from the medical college of Seoul National University in 1979. He did training in the department of obstetrics and gynecology of the same college, and joined the faculty there from 1988 until the present.