The sentences have different beginnings, lengths, and structures. The writing sounds natural, with one sentence flowing effortlessly into the next. Varied sentence beginnings guide the reader readily from one sentence to the next. Variation in sentence structure and length adds interest to the text. Fragments, if used at all, work well.
Most sentences are complete.
Dialogue, if used, sounds like people talking. It may sound technical or mechanical instead of pleasant and musical. Simple sentences are okay, but compound sentences and complex sentences are not. The sentences make sense, but do not seem skillfully written. There is some variety in sentence beginnings, length, and structure.