Complex sentence: It is situated in the highly urbanised area of South East Wales, and its metropolitan area has a population of 1,097,000, followed by Swansea and Newport also in the south of the country.
Split into simpler sentences: It is situated in the highly urbanised area of South East Wales, and its metropolitan area has a population of 1,097,000. The next largest cities are Swansea and Newport, also in the south of the country.