Input (grade 13): Under the leadership of Heinrich Himmler between 1929 and 1945, the SS grew from a small paramilitary formation to one of the largest and most powerful organizations in the Third Reich.
Output (grade 8): Heinrich Himmler was its leader from 1929 to 1945. During that time, the SS grew from a small paramilitary formation to become one of the largest and most powerful organizations in Nazi Germany.