Complex sentence: He made his professional debut in September 2005 and soon established himself as a regular at the City of Manchester Stadium and his performances saw him earn international recognition with Republic of Ireland however a row with Steve Staunton saw his international career come to an abrupt end.
Split into simpler sentences: He made his professional debut in September 2005 and soon established himself as a regular at the City of Manchester Stadium and his performances saw him earn international recognition with Republic of Ireland. However, a row with Steve Staunton saw his international career come to an abrupt end.