Complex sentence: Fury states that the Afghan forces would usually leave the battlefield in the evenings to break their Ramadan fasts, thereby allowing the al-Qaeda forces a chance to regroup, reposition, or escape.
Split into simpler sentences: Fury states that, as it was Ramadan, the Afghan forces would usually leave the battlefield in the evenings to break their day-long fasts. He suggested this allowed the al-Qaeda forces a chance to regroup, reposition, or escape.