Complex sentence: Hsu's father is an Italian-American and her mother is Taiwanese, but before Hsu was born her father left her mother, leaving Hsu's mother to raise Hsu with the assistance of her grandfather, grandmother, and her mother's other family members.
Split into simpler sentences: Hsu's father is an Italian-American and her mother is a Taiwanese. Her father left the family before she was born, leaving Hsu's mother to raise Hsu with the assistance of her grandfather, grandmother, and her mother's other family members.