Complex sentence: The Kingdom of Kurdistan refers to two short-lived unrecognized states formed in the 1920s in the geo-cultural region of Kurdistan after the collapse of the Ottoman Empire, in the territory, officially under the jurisdiction of the British Mandate of Mesopotamia.
Split into simpler sentences: The Kingdom of Kurdistan refers to two short-lived unrecognized states formed in the geo-cultural region of Kurdistan following the collapse of the Ottoman Empire. Officially, the territory involved was under the jurisdiction of the British Mandate of Mesopotamia.