Complex sentence: After Roma appointed new coach Vincenzo Montella, Doni returned to the side's starting XI. Both Júlio Sérgio and Doni, however, left the club under new management and new owner in 2011--12 Serie A, which the club already signed Gianluca Curci in June.
Split into simpler sentences: After Roma appointed new coach Vincenzo Montella, Doni returned to starting eleven. However both players left the club under new management and new owner in 2011--12 Serie A, which the club already signed Gianluca Curci in June.