Simplify the following text for a Grade 8 native English-speaking person.
Original: Mickey Mouse , Donald Duck and Goofy were marked to make an appearance ( despite that Donald and Goofy were seen smoking in early cartoons ) , but were replaced with Huey , Dewey , and Louie .
Simplified: Mickey Mouse , Donald Duck and Goofy were marked to make an appearance , but were replaced with Huey , Dewey , and Louie .