Complex sentence: Following the influx of gold miners to the Black Hills of South Dakota, war broke out when the native followers of Chiefs Sitting Bull and Crazy Horse left their reservations, apparently to go on the war path and defend the sacred Black Hills.
Split into simpler sentences: Following the influx of gold miners to the Black Hills of South Dakota. War broke out when the native followers of Chiefs Sitting Bull and Crazy Horse left their reservations, apparently to go on the war path and defend the sacred Black Hills.