谁能帮忙详细分析下这句话,包括其结构和意思.

题目

谁能帮忙详细分析下这句话,包括其结构和意思.
That is why, in a famous passage, he defends the study of the 'lower' animals and how they work as being as worthy a human study as the grander stury of the heavenly bodies.

答案

That is why,in a famous passage,he defends the study of the 'lower' animals and how they work as being as worthy a human study as the grander stury of the heavenly bodies.主语：That （那）系动词：is ...