Complex sentence: John Poulett, 1st Earl Poulett KG (1663--28 May 1743) was the son of John Poulett, 3rd Baron Poulett and his wife Susan Herbert, daughter of Philip Herbert, 5th Earl of Pembroke.
Split into simpler sentences: John Poulett, 1st Earl Poulett KG (1663--28 May 1743), was an English peer. Poulett was the son of John Poulett, 3rd Baron Poulett and his wife Susan Herbert, daughter of Philip Herbert, 5th Earl of Pembroke.