Cwm is a Welsh word describing a kind of circular valley head created through glacial erosion; a fjord is a long, deep and narrow sea inlet (which Norway is famous for); glyphs means symbols; vext is an archaeic spelling of vexed, which means annoyed (here as in past tense) and quiz is used in the sense of an eccentric person.

Thus, the sentence can be rewritten as: the symbols on the inlet’s banks at the valley head annoyed the eccentric person.