Complex sentence: Adai Khan of the Khorchin challenged the power of the Four Oirats and the Ming court over the succession struggle of Northern Yuan Dynasty, however, he was killed by them in Ejene in 1438 and his tribe was forced to flee southward.
Split into simpler sentences: Adai Khan of the Khorchin challenged the power of the Four Oirats and the Ming court in the succession struggle of Northern Yuan Dynasty. However, he was killed by them in Ejene in 1438 and his tribe was forced to flee southward.