Original sentence: The Catalan language is estimated to be spoken by rather more than a quarter of the population and understood by more than 40%, due both to the Catalan history of the region and the proximity of the autonomous community of Cataloniain neighboring Spain, where Catalan is co-official
Edited sentence: The Catalan language is estimated to be spoken by rather more than a quarter of the population and understood by more than 40%, due both to the Catalan history of the region and the proximity of the principality of Catalonia, where Catalan is official