Complex sentence: Founded in the 1680s, the communities which comprised Les Mines grew and prospered based on skilled use of dyked marsh lands for agriculture but they were destroyed in the 1755 Bay of Fundy Campaign of the Deportation of the Acadians.
Split into simpler sentences: Founded in the 1680s, the communities which comprised Les Mines grew and prospered based on skilled development of dyked marsh lands for agriculture. However the settlements were were destroyed in the 1755 Bay of Fundy Campaign of the Deportation of the Acadians.