That hard work has earned them a prized sliver of what is becoming one of the fastest-growing markets for wine imports.

【翻译】对于葡萄酒进口增长最快的这一市场，他们的辛勤工作为他们赢得了宝贵的份额。

【分析】

1. That hard work （主语）has earned （谓语动词）them （间接宾语）a prized sliver （直接宾语）of what is becoming one of the fastest-growing markets for wine imports.（of 词组作a prized sliver 的定语）

2. 在这个of 词组中，what 是“融合性关系代词”，引导宾语从句。what 相当于the market which，本身没有疑问概念。

3. a prized sliver ：宝贵的份额。后面整个of 短语是其定语，表示“此宝贵份额属于这个葡萄酒进口增长最快的市场的”。

That hard work（主语）// has earned（谓语动词）// them（间接宾语）// a prized sliver （直接宾语）//（直接宾语后置定语）of what is becoming one of the fastest-growing markets for wine imports.

句子语法结构分析如下

(1)That hard work为句子主语成分

(2)has earned 为句子谓语成分

(3)them为句子间接宾语成分(earn sb sth为某人赢得某物：双宾语结构）

(4)a prized silver为句子直接宾语成分

(5)of what is becoming one of the fastest-growing markets for wine imports为介词短语作后置定语，修饰名词“a prized silver”

(6)what is becoming one of the fastest-growing markets for wine imports为名词性从句（宾语从句），宾语从句作介词“of”的宾语成分

宾语从句的语法结构分析如下

主语：what（为融合性连接代词，引导关系分句，相当于the thing that,在句中相当于the market that)

谓语：is becoming

宾语：one

修饰宾语后置定语：of the fastest-growing markets for wine imports