Complex sentence: New York extends into Long Island Sound and the Atlantic Ocean, sharing a water border with Rhode Island; except for areas near the New York Harbor, New York has a mostly land boarder with two Mid-Atlantic states, New Jersey and Pennsylvania.
Split into simpler sentences: New York extends into Long Island Sound and the Atlantic Ocean, sharing a water border with Rhode Island. Except for areas near the New York Harbor, New York has a mostly land boarder with two Mid-Atlantic states, New Jersey and Pennsylvania.