It is the culture, rather than the language that made it difficult for him to adapt to he new environment abroad.
这里rather than也可以简单地用not来代替，“而不是”的意思。
希望你满意，谢谢！O(∩_∩)O~
What makes it hard for them to adapt to the new environment abroad is culture rather than language.
Culture, rather than language is the main reason which makes it hard for them to adapt to the new environment abroad.
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