Complex sentence: Serving the U.S. Pacific Fleet, this base is one of only two such Trident submarine bases operated by the U.S. Navy: the base at Kings Bay, Georgia, used by the U.S. Atlantic Fleet, is the only other.
Split into simpler sentences: Serving the U.S. Pacific Fleet, this Trident submarine base is the one of only two such bases operated by the U.S. Navy. The Trident submarine base at Kings Bay, Georgia, used by the U.S. Atlantic Fleet is the only other.