Complex sentence: Ecotricity is a green energy company based in Stroud, Gloucestershire, England specialising in selling and generating wind power and is built on the principle of heavily reinvesting its profit in building more of its own windfarms.
Split into simpler sentences: Ecotricity is a green energy company based in Stroud, Gloucestershire, England specialising in selling and generating wind power. It is built on the principle of heavily reinvesting its profit in building more of its own windfarms.