Complex sentence: The rivers of Galicia form part of a dense hydrographical network in the Spanish autonomous community of Galicia and has been described by Otero Pedrayo as "the land of a thousand rivers".
Split into simpler sentences: The rivers of Galicia form part of a dense hydrographical network in the Spanish autonomous community of Galicia. For the number and density of watercourses the region was described by Otero Pedrayo as "the land of a thousand rivers".