Complex sentence: First Scotrail does not serve Dunbar on Sundays and services are 2 hourly throughout the day except for the evenings where these services are hourly until mid/late evening.
Split into simpler sentences: First Scotrail does not serve Dunbar on Sundays. Train services on Sundays are 2 hourly throughout the day except for the evenings where these services are hourly until mid/late evening.