the school year is divided into two semesters the first of which is september through december ,

题目

the school year is divided into two semesters the first of which is september through december ,
,and the secnd january through may .这个定语从句那部分是定语哪部分是先行词并翻译一下,

答案

一学年分为2个学期,第一个学期从9月到12月,第二个学期从1月到3月.
先行词：semesters
定语从句：the first of which is september through december ,and the secnd january through may