Simplify the following text for a Grade 5 native English-speaking person.
Original: On 24 April 1558 , the fourteen-year-old Dauphin was married to the Queen of Scots in a union that could have given the future kings of France the throne of Scotland and also a claim to the throne of England through Mary 's great-grandfather , King Henry VII of England . However , Mary and Francis were to have no children during their short lived marriage , possibly due to Francis ' illnesses or his undescended testicles .
Simplified: Francis was married to Mary , Queen of Scots , on April 24 , 1558 .