Complex sentence: The town's population is around 8,000, making it the largest town in the Outer Hebrides, with a third of the population of the civil parish of Stornoway, which includes various nearby villages and has a population of approximately 12,000.
Split into simpler sentences: The town's population is around 8,000, making it the largest town in the Outer Hebrides (with a third of the population). The civil parish of Stornoway, including various nearby villages, has a population of approximately 12,000.