Complex sentence: For two years, in what is now Quebec, he had charge of a school for Indian boys, but returned to Huronia in 1638 to relieve Father Brébeuf at the new mission.
Split into simpler sentences: For two years, in what is now Quebec, he had charge of a school for Indian boys. He returned to Huronia in 1638 to relieve Father Brébeuf at the new mission.