Complex sentence: Local trains run every half hour and are operated by London Overground, hourly Southern trains run between East Croydon (previously Brighton) and Milton Keynes (previously Watford Junction), not stopping at Willesden Junction.
Split into simpler sentences: Local trains run every half hour and are operated by London Overground. Hourly Southern trains run between East Croydon (previously Brighton) and Milton Keynes (previously Watford Junction), not stopping at Willesden Junction.