Complex sentence: Considered a fluent Koyukon speaker after spending years in the region, Jette died in 1927, leaving behind a significant quantity of notes on the Koyukon people, their culture and beliefs, and their language.
Split into simpler sentences: Considered a fluent Koyukon speaker after spending years in the region, Jette died in 1927. He had made a significant quantity of notes on the Koyukon people, their culture and beliefs, and their language.