original: 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 .
simplifications: on december 21 1994 the volcano spewed gas and ash which was carried about 16 miles away by prevailing winds . then , on december 21 , 1994 the volcano spewed gas , it is ash was carried as far as 25 km -lrb- 16 mi -rrb- away by prevailing winds . 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 . on december 21 , 1994 the volcano spewed gas and ash which was carried as far as 25 km away by prevailing winds . then , on december 21 , 1994 , the volcano sent out gas and ash which was carried as far as 25 km -lrb- 16 mi -rrb- away by the wind . 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 . 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 . 1 . then , on december 21 , 1994 , the volcano expelled gas and ash which was carried as far as 25 km -lrb- 16 mi -rrb- away by current winds .