Complex sentence: Greta Bösel, née Mueller, (May 9,1908 in Wuppertal-Elberfeld, Germany--May 3,1947) was a trained nurse and became a camp guard at Ravensbrück some time between 1939 and 1943.
Split into simpler sentences: Greta Bösel, née Mueller (May 9,1908--May 3,1947) was a trained nurse. Born in Wuppertal-Elberfeld, Germany, she became a camp guard at Ravensbrück some time between 1939 and 1943.