Complex sentence: Led by local chieftain Inkpaduta (Scarlet Point), a group of 14 Sioux attacked Spirit Lake, a settlement in the northwestern territory of Iowa near the Minnesota border, where they proceeded to kill between 35 or 40 settlers from March 8-9,1857.
Split into simpler sentences: Led by local chieftain Inkpaduta (Scarlet Point), a group of 14 Sioux attacked Spirit Lake, a settlement in the northwestern territory of Iowa near the Minnesota border. The Sioux proceeded to kill between 35 or 40 settlers from March 8-9,1857.