Revival of Anakin Skywalker

Death
In 17 BBY, Darth Vindys attacked the Senate Building on Coruscant with an army of Sith Acolyte clones and managed to hold the building hostage for hours. The Jedi sent a massive attack force since the Army had dwindled under Mothma's Chancellorship. Vindys killed Anakin during the fight, but was in turn killed by Grand Master Yoda.

Anakin Skywalker's body was brought to the Jedi Temple to be buried among the greatest Jedi of the past. The entire Jedi Council was present for the funeral, as well as Ahsoka Tano, Padme Amidala-Skywalker, and Chancellor Zaoku.

Operation Renovamen
Operation Renovamen was a secret plan created by Ducau Zaoku to bring Anakin Skywalker back to life. The plan was kept to himself, for the most part, and was intended to use Anakin to finalize the bridging of the Jedi and Sith. Being the Chosen One, Ducau knew that Anakin would be the only one able to successfully achieve a pure balance in the Force. Right before the seal of his burial, Ducau got to see Anakin's body one-on-one. He injected a tiny capsule into his neck, which spread micro-droids into his decaying body. The droids prevented any further decay, producing some cells that replaced the dead ones.

During the night, a few years after Anakin's burial, Chancellor Zaoku had the body taken out of the Jedi Temple and brought to Los Imperia Hospital's classified facilities. Zaoku didn't want the Republic to oversee the Operation, so he decided that the Gundao Syndicate would do it. He spread word to certain Outer Rim bases that the body of Skywalker would be heading for Kamino. The Chancellor intentionally made it aware to those bases, and the Syndicate's intelligence found out. Security for the body's transport was minimal, with just a few Senate Commandos, and halfway to Kamino; it was attacked by the Syndicate. The Syndicate stole the transport and brought it to their base on Yavin 4.

Ducau Zaoku's plan was for the Syndicate to do all the work, spending much of their money, hoping that they would revitalize Anakin and turn him against the Republic. But knowing Anakin, he was very doubtful and wouldn't believe the Syndicate, since he died before its creation. Anakin would most likely realize that the Syndicate was an enemy of the Republic, and wipe out its leaders. It would've ended the Second Galactic War before it could really catch fire. But, the Syndicate's technology was limited and took over a decade to bring Anakin back to life; and the war boomed into a fiery explosion all across the Galaxy.

The plan essentially worked, but Zaoku had fallen towards the Dark Side, and Anakin fell as well. Anakin Skywalker became Darth Vader, and Ducau Zaoku became Darth Saesarr.