The writing sounds natural and fluent. One sentence flows effortlessly into the next. Variation in sentence structure and length, as well as transitions, adds interest to the text. The writer shows good control over simple sentence structure, more variable control over complex sentence structure. Sentences may not seem skillfully crafted, but they are grammatically correct.
Some transitions are evident and sentences work together.
They get the job done. Sentences do not sound natural, the way someone might speak. Word patterns are often jarring or irregular, forcing the reader to pause or reread. Sentence structure tends to obscure meaning, rather than showing the reader how ideas relate. There is little or no real variety in length or structure.