The language in this poem is pretty straightforward and simple, and so are the sentences. This poem does get a little tricky, though, when it comes to content. All that we see and seem is but a dream within a dream? What in the world is that about?
It's confusing, sure, but it's a classic conundrum that we're all at least a bit familiar with, so it shouldn't throw you for too much of a loop. You've seen Inception after all, right? Right?