Simplify the following text for a Grade 5 native English-speaking person.
Original: His mother , Catherine of Valois , was then 20 years old and , as Charles VI 's daughter , was viewed with considerable suspicion by English nobles and prevented from having a full role in her son 's upbringing .
Simplified: His mother , Catherine of Valois was then only twenty years old . Because she was the daughter of King Charles VI of France she was not allowed to have a large part in raising her son .