Complex sentence: Although the couple lived at the house, Caroline made her brother, Rev. James Douglas, 4th Baron Douglas part owner in 1827, but following both their deaths in April 1857, it was younger sister, Mary Sidney Douglas, who inherited.
Split into simpler sentences: Although the couple lived at the house, Caroline made her brother, Rev. James Douglas, 4th Baron Douglas, part owner in 1827. Following both their deaths in April 1857, it was their younger sister, Mary Sidney Douglas, who inherited.