is this contribution that we who visit china are now making

我们这些来中国参观的人正在做的贡献就是你们的风景区吗?
这是两个定语从句套在一起,主句是Is this contribution your beauty spots?
that we are now making to修饰contribution
who visit china 修饰 we
句子结构比较复杂,其实不是很难翻译,不过这句话也太纠结了吧