Complex sentence: Unlike Ryotaro, Yuto claims that protecting the flow of time isn't the same thing as protecting people, and so saving people is unnecessary if it means disrupting the flow of time even if it means sacrifices must be made to save the future.
Split into simpler sentences: Unlike Ryotaro, Yuto claims that protecting the flow of time is not the same thing as protecting people. He says that saving people is unnecessary if it means disrupting the flow of time even if it means sacrifices must be made to save the future.