Complex sentence: He left to join the Natchez in 1790 and his mission to the Taensa was taken over by Jean-François Buisson de Saint-Cosme, who settled among the Taensa and the Natchez for less than a year.
Split into simpler sentences: He left to join the Natchez in 1790, and his mission to the Taensa was taken over by Jean-François Buisson de Saint-Cosme. He settled among the Taensa and the Natchez for less than a year.