Complex sentence: In the early 15th century French sailors traded their capotes to the Micmac in North America and by 1619 the French habitants wore an altered form of the capote based on the then fashionable justacorps.
Split into simpler sentences: In the early 1600s French sailors traded their capotes to the Micmac in North America and by 1619 the French habitants were also wearing capotes. Fifty years later the habitants wore an altered form of the capote based on the then fashionable justacorps.