Complex sentence: Although the Indian national chieftains signed the treaty, conflict within the Indian nations soon broke out between more radical tribesmen who felt the treaty sold out their claims and tribesmen who felt another war would mean only further losses of territory to the more powerful British colonists.
Split into simpler sentences: Although the Indian national chieftains signed the treaty, conflict within the Indian nations soon broke out. Some tribesmen felt the treaty sold out their claims and opposed it, and others believed that another war would mean only further losses of territory to the more powerful British colonists.