Task: Text Simplification
Input (English): then , on december 21 , 1994 the volcano spewed gas and ash which was carried as far as 25 km -lrb- 16 mi -rrb- away by prevailing winds.
Output (English): then , on december 21 , 1994 , the volcano spewed gas and ash which was carried as far as 25 km -lrb- 16 mi -rrb- away by prevailing winds.