Original: Auschwitz II (Birkenau) was an extermination camp or Vernichtungslager, and was the site of the deaths of at least 960,000 Jews, 75,000 Poles, and some 19,000 Roma (Gypsies).
Simplified: Auschwitz II, that is, Birkenau, was an extermination camp (death camp). In this camp, the Nazis killed at least 1.1 million Jews, 75,000 Polish people, and about 19,000 Roma (gypsies).