Complex sentence: Whilst unionists constitute a majority of the population in the north and east of the region with some smaller communities in the south and west, eastern areas have a much higher population density, and thus collectively Northern Ireland has a unionist majority.
Split into simpler sentences: Whilst unionists constitute a majority of the population in the north and east of the region with some smaller communities in the south and west. Eastern areas have a much higher population density, and thus collectively Northern Ireland has a unionist majority.