According to the authors of your text, consumers are advised to be less concerned about the presence of subliminal messages in advertising and more concerned that ads .

Consumers are advised to be less concerned about the presence of subliminal messages in advertising and more concerned that ads reduce our attention span and our ability to evaluate persuasive messages critically.

Explanation:

We are currently being overwhelmed by all the information we received and all the social media content we are exposed. It is said that we should not be so concerned by subliminal messages, but for our reduced attention span and our critical abilities. Having so much exposure to different types of advertising we might lose attention span and our ability to evaluate persuasive messages critically, conditioning our choices.

which sentences ? that question is incomplete