Complex sentence: Built in 1951 at Curtis Bay, MD by the USCG Yard for $500,000, Lightship 612 was the last ship to serve the Nantucket Shoals station and was also the last US lightship in commission.
Split into simpler sentences: Built in 1951 at Curtis Bay, MD by the USCG Yard for $500,000. The Lightship 612 was the last ship to serve the Nantucket Shoals station and was also the last US lightship in commission.