Which one of the following statements is an example of a complex sentence?
a. the crescent moon is a symbol of islam.
b. neap tide is the best time for digging clams.
c. sparrows at the bird feeder compete for seeds.
d. the earth was spinning when lucas first saw lucille.

as for symbolic actions, the narrator's tearing down the wallpaper in an attempt to find the "woman" in the wallpaper represents her struggle to retain or regain her sanity.   the wallpaper has been part of her confinement and by her tearing it down, she is freeing herself from that confinement.