Simplify the following text for a Grade 9 native English-speaking person.
Original: Mary was uninterested in politics and devoted to James and her children , two of whom survived to adulthood : the Jacobite claimant to the English , Scottish and Irish thrones , James Francis Edward Stuart , known as `` The Old Pretender '' , and Princess Louise Mary .
Simplified: They were Louise Mary and the Jacobite James Francis Edward Stuart , who became known in history as `` The Old Pretender '' .