Complex sentence: The main club rivals of Ballymena United would be local rivals Coleraine, the traditional "Boxing Day" fixture between the two teams attracts large crowds and is one of the most high profile fixtures in the Northern Ireland football calendar.
Split into simpler sentences: The main club rivals of Ballymena United would be local club Coleraine. The traditional Boxing Day fixture between the two teams attracts large crowds and is one of the most high profile fixtures in the Northern Irish football calendar.