Complex sentence: Kilduff was highly rated at Shamrock Rovers as a youngster and after a prolific season at under 21 level, where he scored over 20 goals, Kilduff made the breakthrough to the first team making his debut against Derry City in the Brandywell in May 2007.
Split into simpler sentences: Kilduff was highly rated at Shamrock Rovers as a youngster and after a prolific season at under 21 level, where he scored over 20 goals, Kilduff made the breakthrough to the first team. He made his debut against Derry City in the Brandywell in May 2007.