Complex sentence: Pattani (Patani) or the Sultanate of Patani was a Malay sultanate that covered approximately the area of the modern Thai provinces of Pattani, Yala, Narathiwat and much of the northern part of modern Malaysia.
Split into simpler sentences: Pattani (Patani) or the Sultanate of Patani was a Malay sultanate in the historical Patani Region. It covered approximately the area of the modern Thai provinces of Pattani, Yala, Narathiwat and much of the northern part of modern Malaysia.