Complex sentence: Wilcox, who scored on his debut, played in his usual position as a left sided midfielder, forcing Harry Kewell to move into a more advanced position, helping the Yorkshire side to the semi-finals of the UEFA Cup, where they lost to Galatasaray.
Split into simpler sentences: Wilcox, who scored on his debut, played in his usual position as a left sided midfielder, moving Harry Kewell into a more advanced role. He helped the Yorkshire side to the semi-finals of the UEFA Cup, where they lost to Galatasaray.