Original: Harry suffers another emotional blow, when his godfather, Sirius is killed during a duel with a Death Eater Bellatrix Lestrange at the Department of Mysteries, but Harry ultimately defeats Voldemort's plan to steal an important prophecy and helps uncover Umbridge's sinister motives.
Simplified: Harry suffers another emotional blow, when his godfather, Sirius Black is killed during a battle with Death Eaters at the Department of Mysteries, but Harry ultimately defeats Voldemort's plan to steal an important prophecy and helps uncover Umbridge's sinister motives.