The effect was ... an unnerving assault of light and sound, the piercing racket echoing off the glass walls of the downtown skyscrapers."
(The effect; was; an unnerving assault of light and sound, the piercing racket echoing off the glass walls of the downtown skyscrapers) (the piercing racket; echoing; L:off the glass walls of the downtown skyscrapers)
The effect the piercing racket
was echoing
an unnerving assault of light and sound, the piercing racket echoing off the glass walls of the downtown skyscrapers
L:off the glass walls of the downtown skyscrapers