Original sentence: The Mountain Meadows massacre was a mass killing of the Fancher-Baker wagon train at Mountain Meadows in Utah Territory on Friday, September 11, 1857, by members of the local Mormon militia and Paiute auxiliaries.The emigrants, mostly from Arkansas, were traveling to California just as the Utah War started
Edited sentence: The Arkansas emigrants were traveling to California just as the Utah War started.The Mountain Meadows massacre was a mass killing of the Fancher-Baker wagon train at Mountain Meadows in Utah Territory on Friday, September 11, 1857, by Mormons, some disquised as Native Americans and their alleged Paiute Allies