Complex sentence: The warriors retreated to Prophetstown where, according to one chief's account, the warriors confronted Tenskwatawa and accused him of deceit because of the many deaths, which his spells were supposed to have prevented.
Split into simpler sentences: The warriors retreated to Prophetstown where, according to one chief's account, the warriors confronted Tenskwatawa. They accused him of deceit because of the many deaths, which his spells were supposed to have prevented.