Complex sentence: Nettlehirst near Barrmill was one of the last large traditionally operated lime kilns to operate, surviving until the 1970s, however Broadstone has the substantial remains of one of the largest of the early stone built kilns.
Split into simpler sentences: Nettlehirst near Barrmill was one of the last large traditionally operated lime kilns to operate, surviving until the 1970s. However, Broadstone has the substantial remains of one of the largest of the early stone built kilns.