解答

限定子句原則上都可以拆成兩句話,這裡的第一句話是Two years ago my father acquired a promising start-up.第二句話則是The founder of the start-up was a Taiwanese American.
因為兩句話都有start-up所以可以把它變成關代which,而前面如果有介系詞可以一起移到前面,所以就變成of which了

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