Complex sentence: In 1640, the prior Bento de Siqueira ordered construction of the monastery's library, where books owned by the Infante Luís (son of King Manuel I) and others linked to the religious order were deposited.
Split into simpler sentences: In 1640, the monastery's library, by order of the monastery's prior Friar Bento de Siqueira, was ordered constructed. In this library, the books left by the Infante Luís (son of King Manuel I) and others linked to the religious order were deposited.