Complex sentence: A member of the Fortune 500, Entergy owns and operates power plants with approximately 30,000 megawatts of electric generating capacity, and it is the second-largest nuclear generator in the United States after Exelon Corporation.
Split into simpler sentences: A member of the Fortune 500, Entergy owns and operates power plants with approximately 30,000 megawatts of electric generating capacity, and it is the second-largest nuclear generator in the United States. Entergy is the second largest nuclear power generator in the United States after Exelon Corporation.