Complex sentence: He is best remembered for his defence of Yangzhou from invading armies of the Manchu-led Qing dynasty, and was killed when Yangzhou fell to Qing forces in April 1645.
Split into simpler sentences: He is best remembered for his defense of Yangzhou from invading armies of the Manchu-ruled Qing Dynasty. Shi Kefa was killed when Yangzhou fell to Qing forces in April 1645.