Complex sentence: Coincident with this, in early 1882, Edison opened the world's first steam-powered electricity generating station at Holborn Viaduct in London, where he had entered into an agreement with the City Corporation for a period of three months to provide street lighting.
Split into simpler sentences: Coincident with this, in early 1882, Edison opened the world's first steam powered electricity generating station at Holborn Viaduct in London. Where he had entered into an agreement with the City Corporation for a period of three months to provide street lighting.