Complex sentence: The line then bends considerably southwest, passing west of St. Lawrence Island and St. Matthew Island, then passing midway between Alaska's Aleutian Islands and Russia's Commander Islands before returning southeast to 180 °.
Split into simpler sentences: The line then bends considerably southwest, passing west of St. Lawrence Island and St. Matthew Island. It then passes midway between Alaska's Aleutian Islands and Russia's Commander Islands before returning southeast to 180 °.