Complex sentence: Since this notification of delivery failure to the source does not meet the real-time requirements for reliable delivery, this is not sufficient for critical data, where it is necessary to prove that this critical traffic will be delivered, to some specific probability.
Split into simpler sentences: Since this notification of delivery failure to the source does not meet the real-time requirements for reliable delivery, this is not sufficient for critical data. Hence, it is necessary to prove that this critical traffic will be delivered, to some specific probability.