英语句子，为什么这样理解？？？句子是Mr.mc' academic speciality is language his

英语句子，为什么这样理解？？？
句子是Mr.mc' academic speciality is language history and change, and he sees the gradual isappearance of whom, for example, to be natural and no more regrettable than the loss of the case-endings of old English.
为什么no more than 不理解成这个教授认为古英语词缀比whom 重要，而要理解成whom的消失和古英语词缀的消失一样不重要呢？这对文章整体的把握很重要的。麻烦讲解得详尽一些。谢谢。