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): on december 21 , 1994 , gas and ash from the volcano were carried as far away as 25 km -lrb- 16 mi -rrb- by the prevailing winds.