Complex sentence: At that time Crawford's superior, Charles Swan, had encouraged Msiri to resist Sharpe's British treaty, and a year later Msiri was killed by the Belgians and the region was plunged into chaos.
Split into simpler sentences: At that time Crawford's superior, Charles Swan, had encouraged Msiri to resist Sharpe's British treaty. A year later Msiri was killed by the Belgians, and the region was plunged into chaos.