Input (grade 13): When another Colombian volcano, the Nevado del Huila, erupted in April 2008, thousands of people were evacuated because volcanologists worried that the eruption could be another "Nevado del Ruiz".
Output (grade 8): In April 2008, the Nevado del Huila volcano erupted, and thousands were evacuated. Volcanologists were worried that this could be another "Nevado del Ruiz".