一个句子的结构

wanders

India is a country with at least fifty major regional languages , fourteen of which are officially recognized.

这是偶从LZM书上抄下来一个正确的句子,偶想请问的是

逗号后面是个非限定从句吗? , which前面加 fourteen of 是不是个可以接受的形态?

mary1

没错，是非限定定语从句。