How do we convert Upper case text like this:
WITHIN THE FIELD OF LITERARY CRITICISM, "TEXT" ALSO REFERS TO THE ORIGINAL INFORMATION CONTENT OF A PARTICULAR PIECE OF WRITING; THAT IS, THE "TEXT" OF A WORK IS THAT PRIMAL SYMBOLIC ARRANGEMENT OF LETTERS AS ORIGINALLY COMPOSED, APART FROM LATER ALTERATIONS, DETERIORATION, COMMENTARY, TRANSLATIONS, PARATEXT, ETC. THEREFORE, WHEN LITERARY CRITICISM IS CONCERNED WITH THE DETERMINATION OF A "TEXT," IT IS CONCERNED WITH THE DISTINGUISHING OF THE ORIGINAL INFORMATION CONTENT FROM WHATEVER HAS BEEN ADDED TO OR SUBTRACTED FROM THAT CONTENT AS IT APPEARS IN A GIVEN TEXTUAL DOCUMENT (THAT IS, A PHYSICAL REPRESENTATION OF TEXT).
Into usual sentence case like this:
Within the field of literary criticism, "text" also refers to the original information content of a particular piece of writing; that is, the "text" of a work is that primal symbolic arrangement of letters as originally composed, apart from later alterations, deterioration, commentary, translations, paratext, etc. Therefore, when literary criticism is concerned with the determination of a "text," it is concerned with the distinguishing of the original information content from whatever has been added to or subtracted from that content as it appears in a given textual document (that is, a physical representation of text).