Complex sentence: The town was designated as a "new town" in 1967 and has seen a large population growth as companies and people have settled, changing the rural market town character and today the town has developed into the largest town in Mid Wales.
Split into simpler sentences: The town was designated as a "new town" in 1967 and has seen a large population growth as companies and people have settled, changing the rural market town character. Today, the town has developed into the largest town in Mid Wales.