Complex sentence: The Kingdom of Kano was a Hausa kingdom in the north of what is now Nigeria that dates back before 1000 AD, and lasted until the Fulani jihad in 1805, when the kingdom was replaced by the Kano Emirate, subject to the Sokoto Caliphate.
Split into simpler sentences: The Kingdom of Kano was a Hausa kingdom in the north of what is now Nigeria that dates back before 1000 AD, and lasted until the Fulani jihad in 1805. The kingdom was then replaced by the Kano Emirate, subject to the Sokoto Caliphate.