Complex sentence: Scheer--by now the Grand Admiral ("Großadmiral") of the fleet--intended to inflict as much damage as possible on the British navy, to improve Germany's bargaining position, despite the expected casualties.
Split into simpler sentences: Scheer--by now the Grand Admiral ("Großadmiral") of the fleet--intended to inflict as much damage as possible on the British navy. The goal was to improve Germany's bargaining position, despite the expected casualties.