Complex sentence: Admiral of the Fleet Sir Francis William Austen, (23 April 1774--10 August 1865) was a Royal Navy officer who served as Commander-in-Chief, North America and West Indies Station.
Split into simpler sentences: Admiral of the Fleet Sir Francis William Austen, (23 April 1774--10 August 1865) was a Royal Navy officer. He went on to serve as Commander-in-Chief, North America and West Indies Station.