original: Historically mills were powered by hand (mortar and pestle), working animal, wind (windmill) or water (watermill).
simplifications: In the past mills were powered by hand (mortar and pestle). Mills were also powered by working animal, wind (windmill) or water (watermill). Mills were powered by hand, animal, wind or water. Historically, mills were worked by hand (mortar and pestle), working animal, wind (windmill) or water (watermill). Historically mills were run by hand (mortar and pestle), working animal, wind (windmill) or water (watermill). Mills used to be powered by hand, animals, wind, or water. Historically mills were powered by hand using a mortar and pestle, working animals, wind or water. Before now, Mills were powered by hand (mortal and pestle), working animal, wind (windmill) or water (watermill). In the past, mills were powered by hand (mortar and pestle), working animal, wind or water. Historically mills were turned on and off by hand (mortar and pestle), working animal, wind (windmill) or water (watermill). Historically, mills have been powered by hand (mortar and pestle), by working animals, by wind (windmill) or by water (watermill).