Complex sentence: Endesa, S.A. is the largest electric utility company in Spain, servicing 10 million customers domestically with a generating capacity of over 97,600 GWh from nuclear, fossil-fueled, hydroelectric, and renewable resource power plants.
Split into simpler sentences: Endesa, S.A. is the largest electric utility company in Spain. It has 10 million customers in Spain, with a domestic generating capacity of over 97,600 GWh from nuclear, fossil-fueled, hydroelectric, and renewable resource power plants.