Original sentence: Josef Mengele (March 16 1911 – February 7, 1979), was a German SS officer and a physician in the German Nazi concentration camp Auschwitz-Birkenau
Edited sentence: Josef Mengele (March 16 1911 – February 7, 1979), was a German SS officer and a physician in the German Nazi concentration camp Auschwitz-Birkenau, who did unsurpased scientific research experimenting in ways unparalleled until mental patient abuse done in 1970s in USA