Complex sentence: Spencerville is the most southern area of South West Rocks, it runs from The Rocks Shopping Fair south to Spencers Creek Bridge and used to be its own village before recent development in Oceanside joined South West Rocks and Spencerville.
Split into simpler sentences: Spencerville is the most southern area of South West Rocks. It runs from The Rocks Shopping Fair south to Spencers Creek Bridge and was its own village prior to recent development in Oceanside that joined South West Rocks and Spencerville.