Answer:
to intrigue the reader with details about Nina
to present background information about Nina
Step-by-step explanation:
From the passage, about half of the sentences spoke directly about Nina. With the author giving us information about Nina's looks, the language she speaks, where she lived her adult life. We were also hinted about something she indulges in, her being a movie star. All theae gives a lot of background information about Nina. Going further, the author deviated a little from her background information to tell us some other details about her, information about Nina's husband and the kind of happy relationship they keep. Hence, these gives an more details about Nina
Hence, what the author is describing in the passage is :
to intrigue the reader with details about Nina
to present background information about Nina