Complex sentence: The Advertising Standards Authority (ASA) said the cost was likely to influence a viewer's decision to use the service and a recipient's decision whether to accept a call and that tests of 0800 Reverse revealed that the automated operator did not mention these charges.
Split into simpler sentences: The Advertising Standards Authority (ASA) said the cost was likely to influence a viewer's decision to use the service and a recipient's decision whether to accept a call. They also said that their tests of 0800 Reverse revealed that the automated operator did not mention these charges.