Complex sentence: On February 20, coal supplies to some power plants in Java have been stopped, as ships cannot go to ports because of big waves, resulting in an electricity deficit of about 1,000 megawatts affecting the Indonesian capital, Jakarta.
Split into simpler sentences: On February 20, coal supplies to some power plants in Java were stopped, as ships could not dock at ports due to large waves. This resulted in an electricity deficit of about 1,000 megawatts that affected the Indonesian capital, Jakarta.