Complex sentence: A typical völgyzár were operated by a fortress company which comprised 200-300 soldiers, compared to this a same size of defensive area was operated by a division-sized force in the Maginot-Line.
Split into simpler sentences: A typical völgyzár was operated by a fortress company which comprised 200-300 soldiers. In comparison, a similar size defensive area was operated by a division-sized force in the Maginot-Line.