Complex sentence: Her mother died when she was only 12, leaving her and her twin sister Ila responsible for the whole upkeep of the household and the raising of their younger sister, as well as instilling a longstanding sense of compassion for the hardships of others.
Split into simpler sentences: Her mother died when she was only 12, leaving her and her twin sister Ila responsible for the upkeep of the household and the raising of their younger sister. This instilled within her a longstanding sense of compassion for the hardships of others.