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You just want to join adjacent rows that have no children, right?

If I'm understanding you correctly, you want to copy and paste something like this:

This is a test.
This is another test.
This is a third test.
This is the final row.

and end up with one row? If you want it to look like this:

you can accomplish it simply by changing where you click in OmniOutliner before you do the paste. If you click on the row selection handle before doing the paste, you'll get a separate row for each line delimited by a carriage return. If instead you click in the row text field before doing the paste, you'll get a single row as shown above.

If you want to reflow the text into a single long line you'll need to involve another tool or some manual editing.