Complex sentence: The South East Wales Biodiversity Records Centre definition of South East Wales includes the whole of Glamorgan in addition to Monmouthshire, an area which has a population of approximately 2 million (2007 estimate).
Split into simpler sentences: The South East Wales Biodiversity Records Centre definition of South East Wales includes the whole of Glamorgan in addition to Monmouthshire. This area has a population of approximately 2 million (2007 estimate).