Complex sentence: Whether the Iranian defence could have been successful is debatable and on 29 August, after some more sporadic fighting, word reached the Iranian commanders at Ahvaz that their government had accepted a ceasefire and they were not to fight any longer.
Split into simpler sentences: Whether the Iranian defence could have been successful is debatable. However, on 29 August, after some more sporadic fighting, word reached the Iranian commanders at Ahvaz that their government had accepted a ceasefire, and they were not to fight any longer.