A news article about the benefits of taking vitamin supplements
contained many health suggestions from Dr.Goss, several of (which) were appealing
to many health-conscious individals.
The marketing director has instructed us not to publish the magazine
because he hasn't received a confirmation about the changes (that) he proposed.
선행사가 첫번째는 suggestions, 두번째는 changes라는데
저는 두번째 문장을 변화에 대한 a confirmation라고 해석해서 'a confirmation'이 선행사라고 생각했습니다.
왜 changes가 선행사인지 명확히 설명해주실 분 계신가요..
선행사 파악하는게 처음이어서 요점을 모르겠습니다.