Complex sentence: The French Jesuit Jean de Brébeuf began a mission in Huronia in 1626, and the mission fort of Sainte-Marie, Ontario's first European settlement, followed in 1639 at what is now the town of Midland.
Split into simpler sentences: The French Jesuit Jean de Brébeuf began a mission in Huronia in 1626. In 1639 he oversaw the building of the mission fort of "Sainte-Marie", Ontario's first European settlement, at what is now the town of Midland.