Complex sentence: She was then transferred to the Ravensbrück concentration camp in August 1944: first assigned to earthworks, she was transferred to the revier (camp infirmary) because of her knowledge of the German language.
Split into simpler sentences: She was then transferred to the Ravensbrück concentration camp in August 1944. Initially assigned to earthworks, she was transferred to the revier (camp infirmary) because of her knowledge of the German language.