先纠正一下你的问题.你的问题应当是修饰主句的定语从句,which前加逗号,而不是‘修饰句子的定语从句,which后加逗号’.
逗号应当加在‘which’的前面,而不是加在‘which’的后面.例句如下仅供学习定语从句参考,不推敲其他时态等.
1.My company sets up a new rule for us,which causes the employees unsatisfied.
2.A new regulation was just put into effection,which built up a new atmosphia in this region.