Simplify the following text for a Grade 7 native English-speaking person.
Original: This tests not only Kiara and Kovu 's relationship as they mature , but Simba 's relationship with his daughter .
Simplified: Convinced that Kovu was aware of the ambush , the wounded Simba exiles him and orders Kiara confined to their den . Kiara later escapes and , after a long search , reunites with Kovu .