Complex sentence: The stadium is all-seated, with a capacity of 20,750 making it the largest purpose-built venue in Swansea and the third largest stadium in Wales after the Millennium Stadium and the Cardiff City Stadium.
Split into simpler sentences: The stadium is all-seated, with a capacity of 20,750 making it the largest purpose-built venue in Swansea. It is the third largest stadium in Wales after the Millennium Stadium and the Cardiff City Stadium.