Original sentence: Most maritime nations, consider them to be territorial waters, which means that foreign vessels have right of passage.The Northwest Passage is a sea route through the Arctic Ocean along the northern coast of North America via the Canadian Arctic Archipelago, connecting the Atlantic and Pacific Oceans.These led to a number of expeditions to the Arctic, most notably the attempt by Sir John Franklin.This and the contested sovereignty claims over the waters may complicate future shipping through the region: the Canadian government considers the Northwestern Passages part of the Canadian Internal Waters, but various countries maintain they are international waters beyond Canadian jurisdiction
Edited sentence: Additionally, contested sovereignty claims over the waters may complicate future shipping through the region: the Canadian government considers the Northwestern Passages part of the Canadian Internal Waters, but most other countries maintain they are international waters beyond Canadian jurisdiction.Most maritime nations, however, consider them to be territorial waters, which means that foreign vessels have right of passage.The Northwest Passage is a sea route through the Arctic Ocean along the northern coast of North America connecting the Atlantic and Pacific Oceans, partially via the Canadian Arctic Archipelago.These led to a number of expeditions to the Arctic, most notably the tragic attempt by Sir John Franklin