Complex sentence: The region comprising the Tantramar Marshes on the Isthmus of Chignecto had been settled by French colonists during the 17th and 18th centuries-giving the name Beaubassin to this part of Acadia.
Split into simpler sentences: The region comprising the Tantramar Marshes on the Isthmus of Chignecto had been settled by French colonists during the 17th and 18th centuries. They gave the name Beaubassin to this part of Acadia.