Butterfly in the sky, I can go twice as high

Still reading ‘Ship of Theseus’, I still have no idea what’s going on. I’m dealing with the main story, and the secondary story in 3 different time frames (depending on the colour of the ink). It’s very confusing. I’m going to have to find a guide to reading this book, because I have no idea how to read it. I am enjoying the main story though! Haha