This is an annoying problem for me also. Although Textra gives us the ability make sure the texts we SEND arrive to the recipient in one unjumbled message, there may not be any 100% fool proof way to prevent receiving them that way.

When we use Textra to send, we can choose the option to make any text that contains more the old SMS standard of 140 characters (including spaces and the next paragraph carriage return function) into MMS messages. So we compose a text that exceeds 140 characters or more, even twice and three times 140, it becomes one MMS message in order & one piece.

I'm not a techie, but I believe if our contacts texting program contains that option, ask them to enable that function. That may help in those instances.

If our contact is composing a text from a computer, there may not be a solution even if they're sending one communication less than 140 characters. I have one friend using a laptop whose messages I have gotten used to reassembling everytime. Yuk!

I'm not sure, but other factors

(that can jumble up a received message out of order and in pieces)

might be caused by the sender (them) using a different cell phone provider than ours, or if they hit SEND at a moment during a blackout in coverage and/or while traveling.

Too bad nor everyone is using the premium version of Textra.