Complex sentence: The rest of the road, from there to Swindon, is largely county-road class, It passes by the towns of Langport and Glastonbury and briefly merges with the A39 again.
Split into simpler sentences: The rest of the road, from there to Swindon, is largely county-road class. Next, it passes by the towns of Langport and Glastonbury and briefly merges with the A39 again.