Complex sentence: The recorded history of Darfur begins in the 14th century with the establishment of a Tunjur sultanate, which reached a height as the Keira dynasty began in the seventeenth century.
Split into simpler sentences: The recorded history of Darfur begins in the 14th century with the establishment of a Tunjur sultanate. Independent Darfur reached a height as the Keira dynasty began in the seventeenth century.