Complex sentence: Her father Viswanathan Rajaraman is a brain surgeon, and her mother Mary Sundaram is a physician who gave up practicing to raise their daughter; as is sometimes customary among South Indians, Viswanathan took her father's first name as her last name.
Split into simpler sentences: Her father Viswanathan Rajaraman is a brain surgeon, and her mother Mary Sundaram is a physician who gave up practicing to raise their daughter. As is sometimes customary among South Indians, Viswanathan took her father's first name as her last name.