Original sentence: A theory suggests that Cataluña derives from the term "Land of Castles", having evolved from the term castlà, the ruler of a castle (see castellan).Another theory suggests that Cataluña derives from Gothia, "Land of the Goths", since the Spanish March was one of the places known as Gothia, whence Gothland and Gothlandia theoretically derived.The name Cataluña (Catalonia) began to be used in the 12th century in reference to the group of counties that comprised the Marca Hispanica
Edited sentence: A theory suggests that Catalunya derives from the term "Land of Castles", having evolved from the term castlà, the ruler of a castle (see castellan).Another theory suggests that Catalunya derives from Gothia, "Land of the Goths", since the Spanish March was one of the places known as Gothia, whence Gothland and Gothlandia theoretically derived.The name Catalunya (Catalonia) began to be used in the 12th century in reference to the group of counties that comprised the Marca Hispanica