The world is a book and those (who do not travel) read only one page.

The world is a book and those (who do not travel) read only one page.

The world is a book and those (who do not travel) read only one page.

Opportunity&luck always shows appreciation for those (who are bold in struggling).

Opportunity and luck always favor those who are bold in struggling.

God helps those (who help themselves).

God helps those who help themselves.

The components in brackets here are used as attributive modifications of the preceding ones. They are attributive clauses!