Simplify the following text for a Grade 7 native English-speaking person.
Original: By this point Edmund 's character has matured a great deal which can be seen in the way he deals with his cousin Eustace and in the power struggle with Caspian .
Simplified: By this point Edmund had matured a great deal which can be seen in the way he deals with Eustace ( cousin ) and in the fights with King Caspian .