Complex sentence: Born in Madrid, Coke was a product of Rayo Vallecano's youth system, being promoted to the main squad for the 2005--06 season at only 18, with the capital club in the third division.
Split into simpler sentences: Born in Madrid, Coke was a product of Rayo Vallecano's youth system. He was promoted to the first team for the 2005--06 season at only 18, with the Madrid side in the third division.