Complex sentence: He and Sun Kewang first aided Ming royalists by suppressing a rebellion in Yunnan in 1648, they then made strikes to stop the advance of the Qing army in Sichuan and Huguang.
Split into simpler sentences: He and Sun Kewang first aided Ming royalists by suppressing a rebellion in Yunnan in 1648. They then stopped the advance of the Qing army in Sichuan and Huguang.