Complex sentence: On his death the dukedom became extinct while he was succeeded in the earldom by his distant relative, the eighteenth Earl, a descendant in the tenth-generation of the Hon. Sir Henry Fynes-Clinton, third son of the second Earl.
Split into simpler sentences: On his death the dukedom became extinct while he was succeeded in the earldom by his distant relative, the eighteenth Earl. He was a descendant in the tenth-generation of the Hon. Sir Henry Fynes-Clinton, third son of the second Earl.