Complex sentence: In spring 1943, to his bemusement, Seel was sent to Pomerania to a Lebensborn, one of a dozen places in the Reich dreamed up by Himmler and dedicated to breeding the new pure race.
Split into simpler sentences: In spring 1943, to his bemusement, Seel was sent to Pomerania to a Lebensborn. One of a dozen places in the Reich dreamed up by Himmler and dedicated to breeding the new pure race.