The word "like" makes this sentence a simile. The reason that a simile is being made between the woman and St. Sebastian is because Winston has been riled up and driven to thoughts of violence by the Two Minutes of Hate. He does not believe in the lies of Big Brother, but he cannot help but be swept up in it.
He looks for something on which to focus his hate because the supposed Enemy of the People is too cartoonish. If you look at the entire scene (not just this sentence), words that imply sex are being used by the author. So, besides a sense of hate, Winston is also thinking about this woman and sex.
The woman had thrown a book at the screen and got his attention. He compared her to St. Sebastian because the saint was killed by the Roman Empire for being a Christian and converting other soldiers to the faith; Sebastian was tied up naked and shot full of arrows. Later on in the paragraph, it states that she is wearing a sash that indicates that she is chaste (does not have sex) and that the sash makes her waist look embraceable.
This contradiction enrages Winston and causes him to have a violent fantasy where he is in power and can punish her "goodness.
Using this simile creates a picture of innocence being mistreated. If he had said "tied her to a stake and shot her full of arrows like a thieving criminal" the image would not conjure the same sense of sympathy for the arrow filled victim.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.