Complex sentence: Apolo Robin Nsibambi is a Ugandan academic and politician who was Prime Minister of Uganda from 5 April 1999 until 24 May 2011.
Split into simpler sentences: Apolo Robin Nsibambi is a Ugandan academic and politician. He is the former Prime Minister of Uganda, a post he held from 5 April 1999 until 24 May 2011.