Complex sentence: She was the daughter of Reuben Abraham, a businessman from Kolkata, and Matilda Isaac, from Karachi, with 3 siblings from her father's previous marriage to Liya, and 6 siblings from their parents' marriage.
Split into simpler sentences: She was the daughter of Reuben Abraham, a businessman from Kolkata, and Matilda Isaac, from Karachi. She had 3 siblings from her father's first marriage to Liya, and 6 siblings from her own parents' marriage.