You don't need to break the chain. It cannot "knot" itself when it's a closed loop and passing through the rear derailleur, so you simply have to unfurl the loops. The video posted earlier is the best explanation of why it happens and how to undo it, and if you watch it a few more times, it should be easy to follow. Just do what the video says, and 1) try moving the loops out as far apart as possible, 2) flip the chain around the pulley/jockey wheels of the rear derailleur since it's the easiest reference point that cannot be messed up because the chain cannot twist when it's passing through the derailleur, and then continue running the chain along the chainstay from the RD until you loop it around the chainring. When it gets over the chainring, the chain should have already unfurled itself.
Do exactly what the video does starting at 1 minute and 54 seconds. The video shows what happens when the bike is upside down, but if your bike is right side up, it's exactly the same process, except you're going to be flipping the chain over the top of the chainstay instead of under the chainstay.
youtu.be/6iuLauaK0Ao?t=114
Copy the text above and paste it into your browser so that it goes directly to 1:54, or 114 seconds into the video. He says "knot", but it's not technically a knot. It's just a loop.
Last edited by tomtomtom123; 12-02-19 at 05:30 PM.