Complex sentence: The walker's usual speed is approximately 1.5 km/h. It does not actually walk, however, instead dragging its "feet" on wheels meaning it is not technically a walker and merely has the appearance of one.
Split into simpler sentences: The walker's usual speed is approximately 1.5 km/h. It does not actually walk, however, instead dragging its "feet" on wheels. This means it is not technically a walker; it merely has the appearance of one.