Input (grade 13): The Pinar del Río province contains one of Cuba's three main mountain ranges, the Cordillera de Guaniguanico, divided into the easterly Sierra del Rosario and the westerly Sierra de los Organos.
Output (grade 8): The Pinar del Río province has one of Cuba's three main mountain ranges, the Cordillera de Guaniguanico. The mountains are divided into the easterly Sierra del Rosario and the westerly Sierra de los Organos.