To understand the width and depth to which science can be applied to the material and spiritual problems that confront individuals and nations requires an understanding of what science really is.
to which science can be applied是定语从句吧,To understand the width and depth to the material and spiritual problems requires an understanding是主干, that confront individuals and nations 修饰 problems
主语To understand the width and depth,谓语 requires 宾语an understanding of what science really is.其中, to which science can be applied to the material and spiritual problems that confront individuals and nations是定语从句,修饰前面的宽度和深度, that confront individuals and nations修饰问题和材料,