Complex sentence: In 1711, he was created Viscount Lewisham and Earl of Dartmouth; in 1713 he exchanged his offices for that of Lord Privy Seal, which he held until the end of 1714.
Split into simpler sentences: In 1711, he was created Viscount Lewisham and Earl of Dartmouth. In 1713 he exchanged his offices for that of Lord Privy Seal, which he held until the end of 1714.