Simplify the following text for a Grade 6 native English-speaking person.
Original: Betrayed to the authorities by a jealous ostler ( stableman ) , the highwayman escapes ambush when Bess sacrifices her life to warn him .
Simplified: A jealous ostler ( person who works in the stable ) who is in love with Bess reports the highwayman to the army . When they come to ambush him , Bess kills herself to warn him and save his life .