Complex sentence: According to the German official history the IV Corps commander, Sixt von Armin, issued an order at 11:15 that turned the individual fights into a coordinated battle but there is no evidence of German command and control above the divisional level.
Split into simpler sentences: According to the German official history the IV Corps commander, Sixt von Armin, issued an order at 1115 that turned the individual fights into a coordinated battle. However, there is no evidence of German command and control above the divisional level.