Her discussion of the importance of sleep as a gateway to this more fulfilling way of living struck such a powerful chord that she realized the mystery and transformative power of sleep called for a fuller investigation.

问题1：这句话的谓语部分是called for a fuller investigation还是struck such a powerful chord？
—— 这是一个主从句：such...（主句）that（从句）... 各有一个谓语部分。

1. 主句的谓语部分是：struck such a powerful chord

2. 从句的谓语部分是：realized the mystery and transformative power of sleep called for a fuller investigation.

3. 在 realized 的宾语从句中，called for a fuller investigation 是宾语从句的谓语部分。

问题2：如何划分这句话的句子成分？（我自己简单地划分了一下，如下，不知正确与否）
Her discussion of the importance of sleep---主语 （正）主句的主语
as a gateway to this more fulfilling way of living struck such a powerful chord that she realized the mystery and transformative power of sleep---原因状语（错） 
called for a fuller investigation---谓语（上面已经分析，是 realized 的宾语从句的谓语部分。）
——看红色部分。as a gateway to this more fulfilling way of living struck such a powerful chord，是主语的定语。

问题3：如何翻译这句话？

【翻译】她对睡眠重要性的讨论引起了强烈的共鸣，睡眠是通向这种更有成就感的生活方式的必由之路，结果，她意识到睡眠的神秘和变化的力量需要更加全面的调查。