Complex sentence: McClean was born in Derry, Northern Ireland and played for the Northern Ireland national under-21 football team, but declined a call-up to the senior squad because he wanted to play for the Republic of Ireland.
Split into simpler sentences: McClean was born in Derry, Northern Ireland and played for the Northern Ireland national under-21 football team. However, McClean declined a call-up to the top level squad because he wanted to play for the Republic of Ireland.