Complex sentence: Professor Mazrui has in the past lived and worked in Uganda at Makerere University from 1965 to 1973 as Head of the Department of Political Science (1965-1973) and Dean of the Faculty of Social Sciences (1967-1969).
Split into simpler sentences: Professor Mazrui has in the past lived and worked in Uganda. He was at Makerere University from 1965 to 1973 as Head of the Department of Political Science (1965-1973), and Dean of the Faculty of Social Sciences (1967-1969).