Simplify the following text for a Grade 7 native English-speaking person.
Original: Cale and Akima overhear an argument between Korso and the Drej Queen , and discover that Korso and Preed are working with the Drej to try to destroy the Titan in exchange for money , since Korso thinks that the human race is doomed anyway and there is no hope ; they escape from the Valkyrie , but Akima is shot and wounded by Preed in the chase .
Simplified: Before long , Cale and Akima find out that Korso is looking for the Titan in order to hand it over to the Drej .