A useful map with one missing feature
1A volunteer group made a digital map of neighborhood walking routes. The map showed entrances and resting places clearly. It worked well on large screens. However, its labels were difficult to read on a small phone. The group tested it with visitors instead of assuming that a clear desktop version would be clear everywhere.
2A reviewer wrote, "The map worked on large screens, however, the labels were unclear on phones." The contrast in meaning was reasonable, but the sentence joined two independent clauses with only a comma before however. The editor kept the contrast and changed the sentence boundary: "The map worked on large screens; however, the labels were unclear on phones."
3The revision did not solve the map's design problem by itself. It made the report grammatically clearer. The designers still needed to adjust the labels and test them again. A good review therefore kept two tasks separate: describing the problem correctly and changing the product that caused the difficulty.