Complex sentence: He graduated Doctor of Philosophy (DPhil) in African History in 1994; his doctoral thesis was titled "A social and conceptual history of North-East Zimbabwe, 1890-1990" was completed in 1994.
Split into simpler sentences: He graduated Doctor of Philosophy (DPhil) in African History. His thesis was titled "A social and conceptual history of North-East Zimbabwe, 1890-1990" was completed in 1994.