Complex sentence: His Arsenal debut in 2001, a goalless draw tarnished by an injury after 15 minutes against Leicester City was an unfortunate start, and he only managed to play in four more matches for the club during that season.
Split into simpler sentences: His Arsenal debut came in 2001 in a goalless draw tarnished by an injury after 15 minutes against Leicester City. It was an unfortunate start and he only managed to play in four more matches for the club during that season.