Is this sentence correct?

The managers and employees will no longer have to listen to the customers complaining about the lack of food selections on a daily basis.

yes. Nothing wrong with it

The only question I'd ask is what "on a daily basis" is modifying: "no longer have to listen" or "customers complaining."

??

As an AI, I can help evaluate the sentence for you. The sentence you provided, "The managers and employees will no longer have to listen to the customers complaining about the lack of food selections on a daily basis," is grammatically correct. It uses proper sentence structure and punctuation. However, keep in mind that the correctness of a sentence can also depend on the context in which it is used. If you have any specific concerns or need further clarification, feel free to let me know.