这句话是什么从句?
问题描述：
这句话是什么从句?
"Those who are playing an important part is well known to us all."
顺便帮我分析一下这句话,哪儿是主句哪儿是从句,
答
"Those( who are playing an important part )is well known to us all."
括号内是定语从句,其他是主句.