Complex sentence: But Buffalo Hump was determined to do more than merely complain about what the Comanches viewed as a bitter betrayal; spreading word to the other bands of Comanches that he was raiding the white settlements in revenge, Buffalo Hump led the Great Raid of 1840.
Split into simpler sentences: But Buffalo Hump was determined to do more than merely complain about what the Comanches viewed as a bitter betrayal. Spreading word to the other bands of Comanches that he was raiding the white settlements in revenge, Buffalo Hump led the Great Raid of 1840.