A concise sentence contains only the number of words necessary to achieve its effect or to convey its message.
Every word serves a purpose in a concise sentence.
Because it is free of unnecessary words and convoluted constructions that interfere with the intended meaning of the sentence, a concise sentence is also clear and powerful. They are usually so general, so broad, so vague that they mean nothing. Rewrite them to make them more specific, more meaningful. From now on, before you turn in you final drafts, go over your rough drafts and look for meaningless words.