Complex sentence: Re-occupied with the French colonisation effort of the 1600s, the area was used for agricultural activities until the 1960s when residential developments took over and transformed the area into a residential suburb of Québec City.
Split into simpler sentences: Re-occupied with the French colonisation effort of the 1600s, the area was used for agricultural activities until the 1960s. Starting from the 60s, residential developments have taken over and the area is now a residential suburb of Québec City.