Complex sentence: He made his first-team debut in a League Cup match against Birmingham City on 14 October 1997 and his performances in Arsenal's reserves resulted in him gaining a place in the England squad for the 1999 FIFA World Youth Championship.
Split into simpler sentences: He made his first-team debut in a League Cup match against Birmingham City on 14 October 1997. His performances in Arsenal's reserves resulted in him gaining a place in the England squad for the 1999 FIFA World Youth Championship.