Complex sentence: The Soviet leaders launch a nuclear strike against America, and the American President retaliates: nearly two hundred million Americans and over a hundred million Soviet citizens are killed, and tsunamis hit both California and New York.
Split into simpler sentences: The Soviet leaders launch a nuclear strike against America, and the U.S. President retaliates. Nearly two hundred million Americans and over a hundred million Soviet citizens are killed in the ensuing nuclear exchange, and tsunamis hit both California and New York.