Complex sentence: Much of the fighting in the Boxer Rebellion against the foreigners in defense of Beijing and Manchuria was done by Manchu Banner armies which were destroyed while resisting the invasion, the German Minister Clemens von Ketteler was assassinated by a Manchu.
Split into simpler sentences: Much of the fighting in the Boxer Rebellion against the foreigners in defense of Beijing and Manchuria was done by Manchu Banner armies which were destroyed while resisting the invasion. The German Minister Clemens von Ketteler was assassinated by a Manchu.