Complex sentence: Prof. Nizami joined Aligarh Muslim University, in the Department of History, in 1947.and he served as Vice-Chancellor (acting) from 3 January 1974 to 30 August 1974.
Split into simpler sentences: Prof. Nizami joined Aligarh Muslim University, in the Department of History, in 1947. He was a Professor there for several years and later served as Vice-Chancellor (acting) from 3 January 1974 to 30 August 1974.