Complex sentence: Theosophical texts posit that the purpose of this Office is to facilitate the transfer of knowledge about the true constitution and workings of all existence to humankind, thereby advancing Humanity on its reputed cyclical, but ever progressive, evolutionary path.
Split into simpler sentences: Theosophical texts posit that the purpose of this Office is to facilitate the transfer of knowledge about the true constitution and workings of all Existence to humankind. Humanity is thereby assisted on its reputed cyclical, but ever progressive, evolutionary path.