Complex sentence: The vessel's manufacturer, Bollinger Shipyards, of Lockport, Louisiana, delivered the ship to the Coast Guard on December 13,2016, for her acceptance trials, and then "John F. McCormick" was commissioned on April 12,2017 in Ketchikan, Alaska.
Split into simpler sentences: The vessel's manufacturer, Bollinger Shipyards, of Lockport, Louisiana, delivered the ship to the Coast Guard on December 13,2016, for her acceptance trials. Then, "John F. McCormick" was commissioned on April 12,2017 in Ketchikan, Alaska.