Complex sentence: According to Theosophical doctrine one of the Hierarchy's functions is to oversee the Evolution of Humankind; in accord with this function the Maitreya is said to hold the so-called "Office of the World Teacher".
Split into simpler sentences: According to Theosophical doctrine, one of the Hierarchy's functions is to oversee the evolution of Humankind. In accord with this function the Maitreya is said to hold the so-called "Office of the World Teacher".