Complex sentence: Towards the end of 2012 Allstar introduced a network service fee on its card transactions which represents a small percentage of overall fuel expense and is directly related to costs incurred supporting the cost of serving, maintaining and improving its network.
Split into simpler sentences: Towards the end of 2012 Allstar introduced a network service fee on its card transactions. This was reported to represent a small percentage of overall fuel expense directly related to costs incurred supporting the cost of serving, maintaining and improving its network.