Well, I didn't really zip, but it wasn't difficult for the most part. Some of the footnotes were interesting, some were just the original Latin or Greek of what he was saying in the main text. But the whole passage is much easier if you've read the rest of the book, or the chapter at least, because you know what he's talking about.

&c = et cetera
laus gloria, were glosses for the Slavonic word slava
Constant. Porphyr. de Administrando Imperio, a reference to Constantine Porphyrogenitus's book "On the Administration of the Empire".
The Sorabians were a people mentioned earlier.
viiith, people were more familiar with Roman numbers in those days, but I took it in at a glance.

Bingley

Bingley