Complex sentence: It is the largest Gothic cathedral and the third-largest church in the world.were registered in 1987 by UNESCO as a World Heritage Site, along the Alcázar palace complex and theGeneral Archive of the Indies.
Split into simpler sentences: It is the largest Gothic cathedral and the third-largest church in the world. It was registered in 1987 by UNESCO as a World Heritage Site, along the Alcázar palace complex and theGeneral Archive of the Indies.