Complex sentence: The "Lightship Ambrose" held its station from 1823 until its replacement in 1967, and was only the fourth lightship designed and commissioned to serve a U.S. coastal port.
Split into simpler sentences: The "Lightship Ambrose" held its station from 1823 until its replacement in 1967. The original Ambrose lightship was only the fourth lightship designed and commissioned to serve a U.S. coastal port.