Complex sentence: In 1942, he was wounded at the Soviet front and was pronounced medically unfit for combat, and was then promoted to the rank of "SS-Hauptsturmführer" (Captain) for saving the lives of three German soldiers.
Split into simpler sentences: In 1942, he was wounded at the Soviet front and was pronounced medically unfit for combat. He was then promoted to the rank of "SS-Hauptsturmführer" (Captain) for saving the lives of three German soldiers.