Who ended the Holocaust?
The Allied armies, coming from both the East (Russians) and the West (British Canadians Poles Americans) forced the Germans to stop fighting and surrender their armies.
The camps were discovered, and the inmates were liberated. Most of them were too sick to go anywhere for a few months. They needed to be fed and given medical treatment. Many died despite the best efforts of the Allies, due to their advanced state of starvation.