Complex sentence: In 1644, Zhu Yujian, a ninth-generation descendant of Zhu Yuanzhang who had been put under house arrest in 1636 under the Chongzhen emperor, was pardoned and restored to his princely title by the Hongguang emperor.
Split into simpler sentences: In 1644, Zhu Yujian was a ninth-generation descendant of Zhu Yuanzhang who had been put under house arrest in 1636 by the Chongzhen emperor. He was pardoned and restored to his princely title by the Hongguang emperor.