Spring is the time of year when people graduate and/or start school in Japan.
In Japan spring is the season when students graduate from school and also the time they begin the new school year.
ーSpring is the time of year when people graduate and/or start school in Japan.
「日本では春は卒業と（または）入学の時期です。」
time of the year when... で「…の時期」
graduate「卒業する」
start school「学校が始まる」
ーIn Japan spring is the season when students graduate from school and also the time they begin the new school year.
「日本では春は学生たちが卒業し、また新しい学年度が始まる時期です。」
season when ...「…のシーズン」
begin the new school year「新しい学年度が始まる」
ご参考まで！
カナダ 
