Complex sentence: Following the evacuation of Auschwitz in January 1945 he was transferred, along with many other former Auschwitz personnel, to the Mittelbau-Dora concentration camp in Thuringia, where he again held the post of chief camp physician until that camp's evacuation in April 1945.
Split into simpler sentences: Following the evacuation of Auschwitz in January 1945 he was transferred, along with many other former Auschwitz personnel, to the Mittelbau-Dora concentration camp in Thuringia. At Mittelbau-Dora, Wirths again held the post of chief camp physician until that camp's evacuation in April 1945.