이유의 부사절 that 절

if there’s any insight at the heart of the new generation of business books like innovation and entrepreneurship, in search of excellence, or the one minute manager, it’s that there’s no long-lasting success without rapport among people, that the way to succeed is to form a successful team that’s working together.

위에서 빨간색 that 절이 두개가 있습니다.
it ~that 강조 구문 사이에 that 절을 이유의 부사절로 해석하는 게 제일 낳은 것 같은데
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