Complex sentence: The regional name Andalusia is derived from the Vandals, then the Moors invaded and occupied Spain from the 6th century to the end of the 15th, the region was called "Al-Andalus".
Split into simpler sentences: The regional name Andalusia is derived from the Vandals. When the Moors invaded and occupied Spain from the 6th century to the end of the 15th, the region was called "Al-Andalus".