Original: During the Tournament's final challenge, Harry and Cedric are teleported to a graveyard where Cedric is killed, and Voldemort, aided by Peter Pettigrew, uses Harry's blood in a gruesome ritual to resurrect Voldemort's body.
Simplified: During the Tournament's final challenge, Harry and Cedric are teleported to a graveyard. Cedric is killed, and Lord Voldemort, aided by Peter Pettigrew, uses Harry's blood in a gruesome ritual to resurrect Voldemort's body.