JH Prynne is ‘hard’. Don’t worry about trying to ‘understand’ this one: Prynne’s poetry is a bit like the sun – hot and powerful, and you can’t look directly at it for too long. (!)
Try looking for patterns of related words in this poem. See what different collections you come up with. And note the words that refer outside the poem – don’t worry at first trying to cohere them, just keep a track of them.