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Should the following be singular or plural?

Most of the books explain it in a way that's difficult to understand.

Since books are plural, shouldn't the part in bold be also plural?

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it refers to the notion being explained. What is difficult to understand? It is not the books. It is what is explained therein. Btw, you've written explian instead of explain. – Pantelis Sopasakis Jun 18 '12 at 15:05
Passing thought; unless all the books explain it the same way, this should be ways that are difficult to understand. – TimLymington Jun 18 '12 at 15:24
up vote 4 down vote accepted

No, it is a contraction of that is. The verb isn't agreeing with books, it's agreeing with way.

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The way it is written is correct. "That's" (that is) refers to the way, which is singular, not the books.

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