Complex sentence: He was content with how his international players, who had been in the World Cup "coped physically" and believed the result gave Arsenal a psychological boost for the Champions League campaign, as the club planned to stage their home matches at Wembley Stadium.
Split into simpler sentences: He was content with how his international players, who had been in the World Cup coped with the game's physicality. Wenger believed the result gave Arsenal a psychological boost for the Champions League campaign, as the club planned to stage their home matches at Wembley Stadium.