Complex sentence: The expected output of 1,950 GWh per year is capable of powering around 400,000 homes, or 40% of the homes in Wales, and preventing the release of about 1.7 million tonnes of carbon dioxide every year.
Split into simpler sentences: The expected output of 1,950 GWh per year is capable of powering around 400,000 homes, or 40% of the homes in Wales. This will prevent the release of about 1.7 million tonnes of carbon dioxide every year.