Complex sentence: The Sultanate of Showa (Sultanate of Shewa) was a Muslim kingdom of uncertain historical origins situated in the territory of present-day Ethiopia, between the Ethiopian Highlands and the Awash River valley.
Split into simpler sentences: The Sultanate of Showa (Sultanate of Shewa) was a Muslim kingdom of uncertain historical origins situated in the territory of present-day Ethiopia. It was situated between the Ethiopian Highlands and the Awash River valley.