Original: After suffering from severe frostbite on the Eastern Front at the end of 1942, he served as an Offizier für wehrgeistige Führung (political officer) at the antiaircraft artillery school in Altenstadt, near Schongau.
Simplified: He got severe frostbite on the Eastern Front at the end of 1942, so he became an Offizier für wehrgeistige Führung (political officer) at the antiaircraft artillery school in Altenstadt, near Schongau, Bavaria.