Complex sentence: In October, a hazard map was finalized for the area around Nevado del Ruiz, highlighting danger from falling material--including ash and rock--near Murillo, Santa Isabel, and Libano, and the threat of lahars in Mariquita, Guayabal, Chinchina and Armero.
Split into simpler sentences: In October, a hazard map was finalized for the area around Nevado del Ruiz. This map highlighted the danger from falling material--including ash and rock--near Murillo, Santa Isabel, and Libano, as well as the threat of lahars in Mariquita, Guayabal, Chinchina and Armero.