Complex sentence: She and her husband lived in New York City with one of her two surviving children, they also raised a granddaughter, Ethel, the orphaned child of Willis's daughter Grace, who passed away in 1862.
Split into simpler sentences: She and her husband lived in New York City with one of her two surviving children. They also raised a granddaughter, Ethel, the orphaned child of Willis's daughter Grace, who died in 1862.