Complex sentence: To the southwest, the Pigeon River is sheltered by Grand Portage Bay; about inland from the bay there is a gap through the surrounding hills and bluffs which provides a gradual ascent to Cascade Falls.
Split into simpler sentences: To the southwest, the Pigeon River is sheltered by Grand Portage Bay. About inland from the bay there is a gap through the surrounding hills and bluffs which provides a gradual ascent to Cascade Falls.