Simplify the following text for a Grade 9 native English-speaking person.
Original: When Eustace ( cousin ) changes his behavior after being changed back from a dragon , Edmund mentions his own betrayal and says that Eustace was not worse than he was with the words `` You are an ass , but I was a traitor '' .
Simplified: When Eustace changes his behavior after being changed back from a dragon , Edmund mentions his own betrayal and says that Eustace was not worse than he was .