Complex sentence: After the birth, the Powell family moved to a two-bedroomed semi-detached house in Hoylake, a middle-class area across the water on the Wirral Peninsula that was considered posh by those in Liverpool.
Split into simpler sentences: After the birth, the Powell family moved to a two-bedroomed semi-detached house in Hoylake. That middle-class area across the water on the Wirral Peninsula was considered posh by those in Liverpool.