彼の本は

as for his book(s)

→ 彼
phrase Rare #30,188
as for his book(s) 彼の means “his,” 本 means “book” or “books,” and は marks the phrase as the topic. Japanese does not usually mark singular and plural nouns separately.
JA: 彼の本は世界中で読まれている。
EN: His books are read all over the world.

彼の本は英国だけでなく日本でも有名だ

His books are famous not only in the UK but also in Japan.

彼の本はほとんど役に立たない

His book is almost useless.

彼の本は全部読んだよ

I've read all of his books.

彼の本はとても面白い

His book is very interesting.

彼の本は全て読みました

I’ve read all of his books.