Complex sentence: The Northern Yuan dynasty, or simply the Northern Yuan, was the Mongol regime based in Mongolia homeland after the fall of the Yuan dynasty in China in 1368, until the emergence of the Qing dynasty founded by the Manchus in the 17th century.
Split into simpler sentences: The Northern Yuan dynasty, or simply the Northern Yuan, was a Mongol régime based in the Mongolian homeland. It operated after the fall of the Yuan dynasty in China in 1368 and lasted until the emergence of the Qing dynasty (founded by the Manchus) in the 17th century.