Complex sentence: The next year Kublai installed Nhân Tông's younger brother Trần Ích Tắc, a defector to the Yuan, as prince of Đại Việt, but hardship in the Yuan's Hunan supply base aborted his plan.
Split into simpler sentences: The next year Kublai installed Nhân Tông's younger brother Trần Ích Tắc, a defector to the Yuan, as prince of Đại Việt. But hardship in the Yuan's Hunan supply base aborted his plan.