Complex sentence: Addionally, the local demographics show a large gap, speaking economically, between affluent residents and poorer communities, many of the affluent residents being people who have moved into the area from other places, such as South East England on their retirement.
Split into simpler sentences: Addionally, the local demographics show a large economic gap between affluent residents and poorer communities. Many of the affluent residents have moved into the area from other places, such as South East England on their retirement.