Complex sentence: There he founded the LaCamas (group of people or other living things) in 1883, named after the Camas lily, a basic foodstuff of the Chinook tribes that lived in the river.
Split into simpler sentences: There he founded the LaCamas (group of people or other living things named after the Camas lily) around 1883,. This lily was used as food by the Chinook tribes that lived in the river.