Sentence:  When, then, the Great Archon had been orally instructed, and every creature of the Ogdoad had been orally instructed and taught, and [after] the mystery became known to the celestial [powers], it was also necessary that afterwards the Gospel should come to the <WSD>Hebdomad</WSD>, in order likewise that the Archon of the <WSD>Hebdomad</WSD> might be similarly instructed and indoctrinated into the Gospel. 
Meaning of the word marked with <WSD> tags:  A group of seven world-creating archons (supernatural beings) often regarded as somewhat hostile; also, a term of address for the (a being sometimes seen as the creator of evil).