不僅如此，當他存夠錢回到家鄉後，和朋友合資開設國術館，對他來說這是一個

不僅如此，當他存夠錢回到家鄉後，和朋友合資開設國術館，對他來說這是一個新的挑戰。

結果 (英文) 1:

Not only that, when he saved enough money to return to his hometown, he opened a joint venture with his friends to open the Guoshu Museum, which was a new challenge for him.

結果 (英文) 2:

Not only that, but when he saved enough money to return home, he set up a joint venture with a friend to open a national art museum, which was a new challenge for him.

結果 (英文) 3:

Not only that, when he saved enough money and returned to his hometown, it was a new challenge for him to set up a joint venture with his friends to open a national art museum.