Complex sentence: Of Gourley's sisters, one died unmarried; another married Mr Joseph Lumsden, chain and anchormaker, of Sunderland, who, after her death, took her sister for his second wife.
Split into simpler sentences: Of Gourley's sisters, one died unmarried and another married Joseph Lumsden, a Sunderland chain and anchormaker. After her death, Lumsden took her sister for his second wife.