Well, I wouldn't start from there if I were you. Can you not save these as comma-delimited with a comma instead of a space to denote the next column.
If that's not possible then you could add a formula like
=E1 & " " & F1 & " " & G1 & " " & H1 & " " & I1
in a column to the right somewhere then drag the formula down as far as needed. You can then copy the column of concatenated text, Edit > Paste Special and paste as values into column E. Then delete the extraneous columns to the right of E. If you have to do this a lot, you could record a macro.