Complex sentence: Hitler ruled Germany autocratically by asserting the "Führerprinzip" ("leader principle"), which called for absolute obedience of all subordinates as he viewed the government structure as a pyramid, with himself--the infallible leader--at the apex.
Split into simpler sentences: Hitler ruled Germany autocratically by asserting the "Führerprinzip" ("leader principle"), which called for absolute obedience of all subordinates. He viewed the government structure as a pyramid, with himself--the infallible leader--at the apex.