Simplify the following text for a Grade 9 native English-speaking person.
Original: Beginning in 2002 , Adamson went through 2500 audition tapes , met 1800 children and workshopped 400 before coming down to the final four actors for the Pevensies .
Simplified: Beginning in 2002 , Adamson went through 2500 audition tapes and met 1800 children before coming down to the final four actors for the Pevensies .