Complex sentence: Empress Zewditu, the daughter of Menilek II, ruled Ethiopia from 1916 until 1930 with Teferi as regent to the throne and later emperor of Ethiopia (1930-1974).
Split into simpler sentences: Empress Zewditu, the daughter of Menilek II, ruled Ethiopia from 1916 until 1930. Teferi became regent to the throne during this time and emperor of Ethiopia after the death of Zewditu (1930-1974).