Complex sentence: In 1916, Bishop's friend John J. MacIntyre published a short book promoting Bishop's authorship of "John Brown's Body" boldly called "The Composer of the Battle Hymn of the Republic".
Split into simpler sentences: In 1916, Bishop's friend John J. MacIntyre published a short book promoting Bishop's authorship of "John Brown's Body". Called "The Composer of the Battle Hymn of the Republic".