Complex sentence: Between 1994 and 1996, he was Lecturer Department of War Studies King's College London and was a Research Fellow at the Centre for Defence Studies, King's College London between September 1996 and August 1999.
Split into simpler sentences: Between 1994 and 1996, he was a Lecturer in the Department of War Studies King's College London. He was later a Research Fellow at the Centre for Defence Studies, King's College London between September 1996 and August 1999.