Complex sentence: According to Sherer, Irataba was head chief of the Mohave from 1861--1866, but by 1867, US government correspondence suggests that Homoseh quahote had succeeded him as head chief of the Fort Mohave group.
Split into simpler sentences: According to Sherer, Irataba was head chief of the Mohave from 1861--1866, but it is unclear if he retained the title, or whether Homoseh quahote was later considered head chief. By 1867, US government correspondence suggests that Homoseh quahote had succeeded Irataba as head chief of the Fort Mohave group.