Complex sentence: Part of the line south of East Grinstead is preserved as the Bluebell Line, and a short stretch of the line at Isfield (between Uckfield and Lewes) is preserved as the Lavender Line.
Split into simpler sentences: Part of the latter south of East Grinstead is preserved as the Bluebell Line. A short stretch at Isfield (between Uckfield and Lewes) is preserved as the Lavender Line.