Complex sentence: He started his football career at the AJ Auxerre youth academy and, on 18 June 2009, after two years solely appearing for the reserves, he left and signed with RCD Espanyol in Spain, being immediately assigned to the reserves.
Split into simpler sentences: He started his football career at the AJ Auxerre youth academy. On 18 June 2009, after two years solely appearing for the reserves, he left and signed with RCD Espanyol in Spain, being immediately assigned to the reserves.