졸업 후에는 제 한국친구들을 만나고 싶어서 휴가로 한국에 여행을 가려고 해요. 

After graduation, because I want to meet my Korean friends, I'm planning to go on a holiday trip to Korea 

KOREAN REVIEW

졸업 = graduation

후에 = postposition for "after"

뭘 / 무엇을 / 뭐를 = what (is)

(하)려고 해요 = verb stem that denotes the will to perform an action

휴가 = vacation or holiday

한국 = S.Korea

여행 = trip or travel

친구(들) = friend(s)

만나다 = to meet

-고 싶다 = verb stem that denotes 'hope' or 'wish' to perform an action

(아/어/해)서 = postposition for "because __, etc etc"