Comments were designed to be sequential, so there isn't a built-in way to move those around or re-order them. If there is certain information you're trying to group together for posterity, it might be good to add that in the description of the card to preserve it best!
Another option would be to delete the comments in between, but I can definitely see how that wouldn't be ideal in all cases.
Hello Community! My name is Brittany Joiner and I am a Trello enthusiast and Atlassian Community Leader. I'll be sharing with you a series of videos with my top tips on how to best use Trello...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event