Complex sentence: She was 2 years old when her mother, Doreen, died giving birth to her brother, who died two days later; unable to cope with her, her father, Harold, had sent her away to live with her maternal grandparents.
Split into simpler sentences: She was 2 years old when her mother, Doreen, died giving birth to her brother, who died two days later. Unable to cope with her, her father Harold had sent her away to live with her maternal grandparents.