Complex sentence: Interestingly, the French fleet defeated here by the Royal Navy was the same French fleet that had blockaded the British Army in at Yorktown, severing all hope of an evacuation for the vastly outnumbered troops trapped by a combined American-French army.
Split into simpler sentences: Interestingly, the French fleet defeated here by the Royal Navy was the same French fleet that had blockaded the British Army in at Yorktown. This severed all hope of an evacuation for the vastly outnumbered troops trapped by the American-French army.