Complex sentence: Then-manager Roberto Martinez decided to call Cornell up to the first team, after loan signing Dimitrios Konstantopoulos was unable to extend his stay at the club, and was placed on the bench for the fifth round FA Cup match against Fulham.
Split into simpler sentences: Then-manager Roberto Martinez decided to call Cornell up to the first team, after loan signing Dimitrios Konstantopoulos was unable to extend his stay at the club. He could be placed on the bench for the fifth round FA Cup match against Fulham.