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語意大約是下面這兩句。
This was his last performance. He is now taking an international tour after that (performance).
兩個獨立句可以用【逗號+連接詞】連接
或者寫成關係子句(使用關係詞)，這樣就可以單純打上逗號
This was his last performance, after which he is now taking an international tour.
