英语语法问题:下面这个句子我在句首添加了一个主语从句，句末添加了一个非限制定从。请问有什么错误吗

Question

It is unquestionable that the phenomenon deserves more and more attention,which has not only brought us a lot of benefits.

Answer 1

语法上是没有错误，但是语义上会比较奇怪。
估计您句末的定语从句想要修饰的应该是phenomenon吧，否则整句的意思是不通顺的，那么就应该将这个定语从句添加在phenomenon后，作为一个插入语。如果留在句末，那么语法上它是修饰attention的。修改后的句子如下：
It is unquestionable that the phenomenon, which has not only brought us a lot of benefits, deserves more and more attention.
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Answer 2

我认为这句话想好一点，最好加上but also，还有改一下时态 例如：
It is unquestionable that the phenomenon deserves more and more attention,which would not only bring us a lot of benefits，but also Increase visibility。（增加知名度）

Answer 3

It is unquestionable that the phenomenon deserves more and more attention,which has not only brought us a lot of benefits.此句没有任何语法错误，但是，总觉得没说完，也就是还应该有下文。“......不仅仅给我们带来好多的利益，（还.....?)".

Answer 4

没问题