Corridor's THE BROKEN PORTAL but with the past and future

I love the newest short from @Corridor ( • THE BROKEN PORTAL ) and thought that it would be cool to see the past and future sides of each portal at the same time as the present. It made me realize they edited the sound to include the past and future - clever.
Because I'm definitely not an editor, I took a screen recording of a Pages document I put the videos in, then used iMovie to combine "takes" without skipped frames, then did another screen recording on my phone to change the aspect ratio to something KZbin likes (4:1).
I need a proper editing app halp
Disclaimer: I'm not claiming ownership of any previously copyrighted songs or images used to make this video. It's entirely composed of Corridor's content edited for educational purposes to understand the incredible concept and choreography behind THE BROKEN PORTAL.