Complex sentence: Some Japanese commanders, such as General Tadamichi Kuribayashi, recognized the futility and waste of such attacks and expressly forbade their men from carrying them out; indeed the Americans were surprised that the Japanese did not employ Banzai charges at the Battle of Iwo Jima.
Split into simpler sentences: Some Japanese commanders, such as General Tadamichi Kuribayashi, recognized the futility and waste of such attacks and expressly forbade their men from carrying them out. Indeed the Americans were surprised that the Japanese did not employ Banzai charges at the Battle of Iwo Jima.