Complex sentence: After Mehmet II (the Conqueror) united most of Anatolia under Ottoman rule, the two empires became neighbours of each other where two Mamluk vassals of Turkmen origin were the buffer states between the two.
Split into simpler sentences: After Mehmet II (the Conqueror) united most of Anatolia under Ottoman rule, the two empire became neighbours of each other. Two Mamluk vassals of Turkmen origin were the buffer states between the two.