Complex sentence: He arrived at Katowice at the outbreak of World War II. He was transferred to Auschwitz concentration camp less than one year later and became Chief of the Political Department, the Gestapo.
Split into simpler sentences: He arrived at Katowice at the outbreak of World War II. He was transferred to Auschwitz concentration camp less than one year later. There he became Chief of the Political Department, the Gestapo.