영문장 구조 분석 부탁드립니다.

if the performance of the ams fails to meet either or both of these drift tests, the cause for this failure should be determined and corrective action taken before the zero- and span-drift testing is repeated. 문장에서요, if the performance of the ams fails to meet either or both of these drift tests 문장하고before the zero- and span-drift testing is repeated는 해석 되는데요,
the cause for this failure should be determined and corrective action taken 문장이 해석이 안 돼요. 특히 corrective action taken 이요!어떻게 the cause for this failure should be determined 다음에 and corrective action taken이 올 수가 있죠?

가르쳐 주시면 정말로 감사하겠습니다.