Complex sentence: It is one of Canada's three Maritime provinces, with its mainland territory consisting of the Nova Scotia peninsula surrounded by the Atlantic Ocean, in addition to over 3,800 coastal islands, the largest one being Cape Breton Island.
Split into simpler sentences: It is one of Canada's three Maritime provinces, including Cape Breton Island and another 3,800 coastal islands. The province's mainland is the Nova Scotia peninsula surrounded by the Atlantic Ocean, and the province includes over 3,800 coastal islands, the largest one being Cape Breton Island.