Suppose you have two characters on opposing sides that share some similarities. We see them go through a struggle that occurs at the same time and is similar in circumstances yet in different areas. TV Tropes explains it better here.
In a TV show or a movie, the script would say how "we" see them cut back and forth between the two characters to show how they're struggles are similar as well as their characters despite their differing allegiances.
My question: how do you show that in literature (like fanfiction) without coming off as clunky or jumbled?
If I'm not clear, ask and I'll attempt to elaborate.