Complex sentence: Under this treaty the Apaches brought spoils back to Canada Alamosa from depredations of settlers and travelers in New Mexico, Arizona and northern Mexico, and traded these spoils for necessities, whisky and ammunition.
Split into simpler sentences: Under this treaty the Apaches brought spoils back to the town of Canada Alamosa from raiding depredations on settlers and travelers in New Mexico, Arizona and northern Mexico. The Apaches traded these spoils for necessities, whisky and ammunition.