Complex sentence: The ship at this time was being outfitted and supplied in Washington, DC, for its next mission but was still months away from being ready, moreover it did not escape from the British blockade at the Chesapeake Bay until 1814.
Split into simpler sentences: The ship at this time was being outfitted and supplied in Washington, DC, for its next mission, but was still months away from being ready. Moreover, it did not escape from the British blockade at the Chesapeake Bay until 1814.