Complex sentence: Parker hired a translator from manager of the Hudson's Bay Company (HBC) trading post Fort Nez Percés, Pierre-Chrysologue Pambrun, to consult with Liksiyu (Cayuse) and Niimíipu (Nez Perce) nobility to use particular areas for Christian proselytising.
Split into simpler sentences: Parker hired a translator from Pierre-Chrysologue Pambrun, manager of the Hudson's Bay Company (HBC) trading post Fort Nez Percés. He wanted help in consulting with the elite of the Liksiyu (Cayuse) and Niimíipu (Nez Perce) in order to identify particular places for missions and Christian proselytising.