Complex sentence: Although the vehicle has not been common on the roads since the 1920s, a few signs survive from the era; a notable example at Wookey Hole in Somerset warns that the road to the neighbouring village of Easton is unsuitable for charabancs.
Split into simpler sentences: Although the vehicle has not been common on the roads for several decades, a few signs survive from the charabancs' era. A notable example at Wookey Hole in Somerset warns that the road to the neighbouring village of Easton is unsuitable for charabancs.