I’ve had a go at translating the commentary to SN 12:48:
Sophist: Having practiced the art of sophistry in natural philosophy. Oldest natural philosophy: The first natural philosophy. Natural philosophy: Of the world it is extensive, extensive for foolish and ordinary people of the world. Regarded as grand and deep, but this doctrine is of a limited nature. Unity: A single nature. Here he enquires about this permanent nature. Plurality: A different nature from the former nature, as with gods and humans etc who, first having been, afterwards do not exist. This enquiry then is in connection with annihilation. Thus, in this case “Everyone Exists, All is Oneness” both these two should be known as Eternalist views whilst “Everyone does not Exist, Everyone is Diverse” both these two are Annihilationist Views.