드릴 말씀은 본교에 근무하시던 김○○ 선생님께서 서울 ○○초등학교 교감으로 승진하시게 되어 학교를 떠나시게 되었습니다.
What I want to say is that Mr. Kim, who worked at this school, will be promoted to the vice principal of Seoul Elementary School and will leave the school.