If you keep using the <pre> method, you could enter shorter lines (no further html code needed), but picking the right number of characters per line is problematic, because people have browsers set at all manner of width.
If you want the readers' browser to set the width, you are better off just abandoning the <pre> method, and inserting <p> at the end of each paragraph.
method, and inserting
at the end of each paragraph.
And "br" at each line to prevent long lines.