Complex sentence: Watson Wentworth built the Hall between 1716 and 1719-his son Thomas Wentworth (d.1750) who had become the 6th Lord Rockingham, was later made up to be the Marquess of Rockingham in 1746.
Split into simpler sentences: Watson Wentworth built the Hall between 1716 and 1719. His son Thomas Wentworth (d.1750) who had become the 6th Lord Rockingham, was later made up to be the Marquess of Rockingham in 1746.