Complex sentence: The Lymington Branch Line was operated as a "heritage" service, known as "The Lymington Flyer", using restored British Rail Class 421s until 22/05/10 when they were withdrawn and the service is now provided by a British Rail Class 158.
Split into simpler sentences: The Lymington Branch Line was operated as a "heritage" service, known as "The Lymington Flyer", using restored British Rail Class 421s until 22 nd May 2010, when they were withdrawn. The service is now provided by a British Rail Class 158.