Complex sentence: Threatened with imprisonment, he made a hasty departure for New England aboard the ship "Griffin", taking his pregnant wife who was so close to term, that she bore her child aboard the ship: they named the child Seaborn.
Split into simpler sentences: Threatened with imprisonment, he made a hasty departure for New England aboard the ship "Griffin", taking his pregnant wife. She was so close to term that she bore her child aboard the ship: they named the child Seaborn.