Complex sentence: Nowadays, the nearest Network Rail station is Castle Cary, some eight miles south of Shepton Mallet, however the nearest station on the East Somerset Railway is Mendip Vale which is a mile and a half away.
Split into simpler sentences: Nowadays, the nearest Network Rail station is Castle Cary, some eight miles south of Shepton Mallet. However, the nearest station on the East Somerset Railway is Mendip Vale, which is a mile and a half away.