Complex sentence: Arsenal's manager, Arsène Wenger, has described him as the best right back in the Premier League, however he has played for Arsenal as a centre back on several occasions.
Split into simpler sentences: Arsenal's manager, Arsène Wenger, has described him as the best right back in the Premier League. In addition to his regular duties in the fullback position, Sagna has played for Arsenal as a centre back on several occasions.