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Now [状语] it [主语] is [系动词] a social policy. [表语]
分句-1
he most important and aggressive promoter of gambling [主语] in America [定语] is [系动词] the government.[表语]
句子翻译
主句
Now it is a social policy.
现在赌博却成为一种社会政策。
分句-1
The most important and aggressive promoter of gambling in America is the government.
在美国，对赌博最重要、最积极的推动者就是政府。
全句
Now it is a social policy: the most important and aggressive promoter of gambling in America is the government.
现在赌博却成为一种社会政策：在美国，对赌博最重要、最积极的推动者就是政府。