Task: Text Simplification
Input (English): historically mills were powered by hand -lrb- mortar and pestle -rrb- , working animal , wind -lrb- windmill -rrb- or water -lrb- watermill -rrb-.
Output (English): -lrb- in the past -rrb- mills were powered by hand -lrb- mortar and pestle -rrb- , working animal , wind -lrb- windmill -rrb- or water -lrb- watermill -rrb-.