Original: 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".
Simplified: In April 2008, the Nevado del Huila volcano erupted, and thousands were evacuated. Volcanologists were worried that this could be another "Nevado del Ruiz".