The sentence you provided is mostly clear but has a couple of minor issues regarding parallel structure and clarity. Here are the errors:
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"affected East Asian countries by allowing for trading to be expanded" - The phrase "for trading to be expanded" could be simplified to "for trade to expand."
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"expanded throughout countries like China and Japan" - The phrase "expanded throughout countries" could be more clearly stated as "expanded in countries."
The grammatical structure could also be improved for overall clarity without changing your words.