Complex sentence: A passionate football player, he began playing for the Garenne-Colombes (Hauts-de-Seine) before joining the Racing Club of France at age 13 and then the AS Monaco formation center in 2005 before making his first appearance in 2007.
Split into simpler sentences: A passionate football player, he began playing for his local club in La Garenne-Colombes before joining Racing Club de France at the age of 13. He proceeded to join the Centre of Formation at AS Monaco FC in 2005 before making his first appearance in 2007.