Complex sentence: He served as secretary to consort of Queen Anne and the Lord High Admiral and Generalissimo of England, Prince George of Denmark, Lord Commissioner of the Admiralty from 20 December 1710 until 14 October 1714.
Split into simpler sentences: He served as secretary to Prince George of Denmark, Queen Anne's consort and the Lord High Admiral and Generalissimo of England. Over the latter period was Lord Commissioner of the Admiralty from 20 December 1710 until 14 October 1714.