Complex sentence: He is said to have been born in Santiago de Compostela, A Coruña, and to have been at the courts of Fernando III and Alfonso X (kings of Galicia 1231-1252 and 1252-1284 respectively).
Split into simpler sentences: He is said to have been born in Santiago de Compostela, A Coruña. He was present at the courts of Fernando III and Alfonso X (kings of Galicia 1231-1252 and 1252-1284 respectively).