Complex sentence: The player will have secured an alliance between China and the United States, ending the Second Cold War, Lynch's survival prevents Menendez's cyberattack from succeeding, and Mason's survival allows him to visit Frank Woods in retirement, reuniting with Section.
Split into simpler sentences: The player will have secured an alliance between China and the United States, ending the Second Cold War. And finally, Mason's survival allows him to visit Frank Woods in retirement, reuniting with Section.