I describe my ongoing lyrics writing projects. Where I get my ideas, how I match my words with other people's music, which little helpers I use...
girl, you see me in despair
you speak in tongues, you are so learned
girl, I think it is not fair
I'm helpless, yet you're unconcerned
Well, it's not the most sophisticated one as bridges come as it does not add a new aspect or provides some interesting twist, but it should do. "complicated" is meant as a straight little fun song, so a straight little fun bridge should suffice.