Short answers, pulled from the story.
The British 11th Armoured Division liberated the Bergen-Belsen concentration camp on the 15th of April 1945. Soldiers discovered approximately 60,000 prisoners inside and another 13,000 unburied corpses lying around the site.
Anne Frank and Margot Frank both died of typhus in February or March 1945 before liberation. Other notable victims included Czech writer Josef Čapek and French Resistance member Jean Maurice Paul Jules de Noailles who died on the 14th of April 1945.
Eleven defendants including commandant Josef Kramer received death sentences that were carried out by hanging on the 13th of December 1945 in Hamelin. Fourteen defendants were acquitted while eighteen others received prison terms ranging from one to 15 years which were later reduced significantly.
By the end of March 1942 some 41,000 Soviet prisoners had died in these three camps from starvation exhaustion and disease. The cemetery contained over 19,500 dead Soviet prisoners when the camp ceased operation in early 1945.
The memorial was finally inaugurated in a large ceremony in November 1952 with the participation of Germany's president Theodor Heuss. A document centre opened in 1966 offered a permanent exhibition on the persecution of the Jews with a focus on events in the nearby Netherlands.