Complex sentence: The Count of Tripoli was the crusader lord of the crusader state of the County of Tripoli from 1102 through 1289, and the last of the four major Crusader states in the Levant to be created.
Split into simpler sentences: The Count of Tripoli was the crusader lord of the crusader state of the County of Tripoli from 1102 through 1289. This state was the last of the four major crusader states in the Levant to be created.