Complex sentence: Their elder son, David Henry Hamar Greenwood, succeeded his father as second Viscount.on his death he was succeeded by his brother, Michael Greenwood, who died unmarried and without issue.
Split into simpler sentences: Their elder son, David Henry Hamar Greenwood, succeeded his father as second Viscount. On his death he was succeeded by his brother, Michael Greenwood, who died unmarried and without issue.