Unnecessary verbiage, as mentioned in the comment you received, simply means using words that don't themselves convey any meaning. Using there is and there are at the start of sentences is an example of this. See below an example of how to edit this.
Original, incorrect sentence: There are many important houses on this street.
Clearer, more precise version of this sentence: Many important houses exist on this street.
Notice that in the revised version the sentence begins with words that immediately convey meaning.