Complex sentence: Although these rules are still part of the laws of war, during the two world wars, changes in technology: radio and the submarine made the rules redundant between belligerents although the Nuremberg Tribunal found that they were still applicable to neutral merchant shipping.
Split into simpler sentences: Although these rules are still part of the laws of war, changes in technology like the radio and the submarine made the rules redundant between belligerents during the two world wars. Still, the Nuremberg Tribunal found that these rules were still applicable to neutral merchant shipping.