关于,which的疑惑,求各位解答

rustraff

定语从句中的that作限定修饰不加逗号直接跟随修饰对象;而which作为非限定修饰要有"逗号"分割或介词"补位",但是做阅读的时候看到有的句子直接which修饰,且没有"逗号",因此求各位大神帮忙解释下这个情况为什么发生呢.
例:have the gains already acquired in pay equity under comparable worth disciplines been of a precedent-setting nature or are they mostly temporary, a function of concessions which is made by employers in order to mislead female employees into thinking that they have got long-term pay equity gains?
标红地方就是which修饰没有"逗号"

370086574

RC里语法是用和SC不附的太多了，甚至还有which指代前句意思的；SC强调的是商业英文语法，不但讲求正确还讲求表达效率，其实which前面没有逗号在标准语法书上是可以的，不能要求那些写RC论文的人都严格按照这个来，所以最好把RC和SC从语法层面分开