Complex sentence: The Buzzard Bay Light was demolished and replaced with a smaller tower in 1996; the Diamond Shoals and Frying Pan Shoals lights have been extinguished, the Diamond Shoals light being sunk and turned into an artificial reef.
Split into simpler sentences: The Buzzard Bay Light was demolished and replaced with a smaller tower in 1996; the Diamond Shoals and Frying Pan Shoals lights have been extinguished. The Diamond Shoals Light was sunk and turned into an artificial reef.