Simplify the following text for a Grade 6 native English-speaking person.
Original: After a bear takes the life of Sitka , the oldest brother , the impulsive youngest brother Kenai kills the bear in revenge , only to be changed into a bear himself by the Great Spirits .
Simplified: He chases the bear up onto a mountain and kills it . The Spirits , represented by Sitka 's spirit in the form of a bald eagle transforms Kenai into a bear after the dead bear 's body disappears .