sentences:  When it became clear that would not be possible, Tolkien turned his full attention to preparing "The Lord of the Rings" for publication.With the success of "The Lord of the Rings", Tolkien in the late 1950s returned to "The Silmarillion", planning to revise the material of his legendarium into a form "fit for publication", a task which kept him occupied until his death in 1973.Much of his later writing from this period was concerned more with the theological and philosophical underpinnings of the work than with the narratives themselves.