Complex sentence: "Beulah" is used as the name of a mystical place, somewhere between Earth and Heaven, in "The Pilgrim's Progress" by John Bunyan and also the works of William Blake, for example several times in "The Four Zoas".
Split into simpler sentences: Beulah has also been used in literature as the name of a mystical place, somewhere between Earth and Heaven. It was so used in "The Pilgrim's Progress"by John Bunyan and in the works of William Blake, for example several times in "The Four Zoas".