Complex sentence: After retiring from football as a player, Arveladze was appointed in July 2008 as assistant manager of AZ under head coach Louis van Gaal, and maintained his position also in the 2009--10 season under Ronald Koeman and Dick Advocaat.
Split into simpler sentences: After retiring from football as a player, Arveladze was appointed as assistant manager of AZ under head coach Louis van Gaal in July 2008. He maintained this position in the 2009--10 season under Ronald Koeman and Dick Advocaat.