original: Then, on December 21, 1994 the volcano spewed gas and ash which was carried as far as 25 km (16 mi) away by prevailing winds.
simplifications: On December 21, 1994 the volcano spewed gas and ash which was carried as far as 25 km (16 mi) away. On December 21, 1994 the volcano released gas and ash which was blown away 25 km by strong winds. On December 21, 1994 the volcano spewed gas and ash with winds carrying it 16 miles away. The 1994 volcanic eruption spewed gas and ash. Winds carried it as far as 25 km (16 mi) away. Then, on December 21, 1994 the volcano spewed gas and ash, which winds carried up to 25 km (16 mi) away. Then, on December 21, 1994 the volcano spewed gas and ash. Prevailing winds carried them as far as 25 km (16 mi) away. Then, gas and ash came out of the volcano. On 12/21/1994, the volcano shot out gas and ash that traveled up to 16 miles away. On December 21, 1994 the volcano blew gas and ash.  The wind took this gas and ash as far as 25 km. Then the volcano spewed gas and ash on December 21, 1994, which was carried away by winds to as far as 25 km (16 mi).