Complex sentence: With the decommissioning of the last,, on 21 September 2005, the "Arleigh Burke" class ships became the U.S. Navy's only active destroyers; the class has the longest production run for any post-World War II U.S. Navy surface combatant.
Split into simpler sentences: With the decommissioning of the last,, on 21 September 2005, the "Arleigh Burke" class ships became the U.S. Navy's only active destroyers. This class has the longest production run for any post-World War II U.S. Navy surface combatant.