Complex sentence: Khan started his career as a literary assistant at "Anjuman Tarraqqi-e-Urdu", thereafter he joined Aligarh Muslim University as a lecturer in Urdu, he was appointed professor in 1986, and in 1996, he retired as chairman of the Urdu Department.
Split into simpler sentences: Khan started his career as a literary assistant at "Anjuman Tarraqqi-e-Urdu". He was appointed professor in 1986 and in 1996, he retired as chairman of the Urdu Department.