Complex sentence: Mansour bin Mutaib joined King Saud University as an assistant professor in 1987 and served as director of the research center in the College of Administrative Sciences from 1987 to 1988.
Split into simpler sentences: Mansour bin Mutaib joined King Saud University as an assistant professor in 1987. Then, he served as director of the research center in the College of Administrative Sciences from 1987 to 1988.