In informal oral speech, speakers frequently apply simplified expressions in order to form short and simple sentences. At the same time, however, oral speech by nature of its ephemerality and unpreparedness, inevitably contains many verbose sentences. Through a comparison between Chinese native speakers and advanced Chinese learners, this paper aims to achieve an analysis and categorization of such simplified and verbose sentences which often appear in advanced Chinese learners’ speech. The inherent cause and effect relationship behind such characteristics will also become clear.