Complex sentence: The main point of Johns book Under Cover is how all pastors are the delegated authorities of God, and in order for believers to be blessed and protected by God they must submit to and obey their pastors.
Split into simpler sentences: The main point of Johns book Under Cover, is that all pastors are the delegated authorities of God. Therefore in order for believers to be blessed and protected by God, they must submit to, and obey their pastors.