The sentence provided is, "The committee came to a decision to discuss in detail about assorted problems that people have been facing for a long time." The word "about" is used incorrectly here. When the word "discuss" is used as a verb, it is not followed by "about." Instead, it should be directly followed by the topic of discussion. Thus, the corrected sentence is: "The committee came to a decision to discuss in detail assorted problems that people have been facing for a long time."