"I can not make the columns"... You mean Table columns, right?
Why is the text split onto a new line?
Is it because there is a paragraph mark (¶), a manual line break (a little
arrow pointing down and to the left), a Tab (arrow to the right), a space (a
small dot hanging half way vertically)? To see those marks, click on "Show
All on the toolbar - the "¶" button.

If there is a paragraph mark, then you have to find some logic so that a
find/replace can get rid of them. The same goes with a manual line break.

If, on the other hand, it is just because the line wraps automatically due
to a space or a tab, then you can select the text and convert it to a table
without any problem. Even if the text is on two (or more) lines, the number
of columns will be determined by the number of tabs between each paragraph
mark, regardless of the number of lines.