Merge text nodes?

I know there's a way to drop a block text down to nodes/single lines. Is there something that will do the opposite? I have a user that's received a file from a satellite office that the CADD Operator, for whatever reason, has all the notes in single lines so that they have to be edited individually. What I'm looking for is something that might recombine them into one text element that can be edited as such. I have a vague recollection that I've seen a way to do this but, for the life of me, cannot recall where.