Complex sentence: A secret nuclear bunker, built in 1951 and operational until 1993, located on the B940 near the village and beneath what during its operational lifetime was an ordinary looking domestic dwelling, has been renovated and is now open to the public as a museum.
Split into simpler sentences: A secret nuclear bunker, built in 1951 and operational until 1993, is located on the B940 near the village. During its operational life, it looked like an ordinary domestic dwelling, but has been renovated and is now open to the public as a museum.