[讨论]杂志上语句语法结构

polarisQQ

 "We found very many human genes undergoing selection," says anthropologist Gregory Cochran. "Most are very recent, so much so that the rate of human evolution over the past few thousand years is far greater than it has been over the past few million years."

这句话我有点不理解,主要在语法上,most are +表语   ,      so much so that +宾语从句 .逗号前面下划线部分构成一个句子,后面so much ao ..... ,怎么感觉应该改为and (they are ) so much so that......才对,如果不是这样,哪so much so that 是作为什么成分?补语?

后面than比较级是不是这样理解:it 指代human evolution ,it has been是(that) it has been这种省略宾语的宾语从句?

感觉自己总是把语言按语法的枷锁来度量,而失去语言本身的内在灵魂---交流,

请指教,3X