Simplify the following text for a Grade 7 native English-speaking person.
Original: Red and Blue have subsequently been remade for the Game Boy Advance as PokÃ mon FireRed and LeafGreen , released in 2004 .
Simplified: PokÃ mon Red and Blue have later been remade for the Game Boy Advance as PokÃ mon FireRed and LeafGreen , released in 2004 .