Complex sentence: Until recent years there was a power station fired by coal, building commenced in 1947, it opened in 1956, and torn down some time during the 1990's; the electrical theme remains with a large 400kV switching station.
Split into simpler sentences: Until recent years there was a power station fired by coal. The station opened in 1956, and torn down some time during the 1990's; the electrical theme remains with a large 400kV switching station.