Video Editing

Hi! I have a 23 sec video made using split screen. Because of that I have a line in the middle of the video and a mirror in the background I need to be deleted. I need to make this split screen as seamless as the split screen in here: https://www.instagram.com/reel/DYO4-c9zs-U/?igsh=cW4yMzB6b2E5bDF3 That’s basically it. Quick task to do if you know how to do it. I need it as soon as possible. Great task to get a 5 star review.