Original: Chun was sentenced to death in 1996 for authorizing the Gwangju massacre, but later pardoned by President Kim Young-sam on the advice of then President-elect Kim Dae-jung, whom Chun himself had sentenced to death some 20 years earlier.
Simplified: He was sentenced to death in 1996. Chun was later pardoned by President Kim Young-sam with the advice of then President-elect Kim Dae-jung, who had sentenced to death by Chun some 20 years earlier.