Can someone please break down that sentence of Alan Moore for me?
I can understand that it somehow means that
who has the same function as what or something like that but I don't understand how that structure means that, I would also appreciate other examples of such structure.
I also understand something like
I'm but a very brilliant guy to mean that I am nothing but a brilliant guy.
This is from the movie V for vendetta where Evey asks V(it's a name of a man who always wears a mask) about who he is when they first meet.
Evey: Who are you? V. : Who? Who is but the form following the function of what and what I am is a man in a mask.