Complex sentence: The Rosicrucian Manifestoes were two documents of unknown authorship written in the 1600s in Europe which purported to announce the existence of a hitherto unkown esoteric order, Brotherhood of the Rose Cross, to the world.
Split into simpler sentences: The Rosicrucian Manifestoes were two documents of unknown authorship written in the 1600s in Europe. They purported to announce the existence of a hitherto unkown esoteric order, the Brotherhood of the Rose Cross, to the world.