How to create a panel for admin to change some contents in HTML? -

My question is, there are some texts that are written on the webpage under the div tag. This lesson should be changed once. But, the person who is updating can not use simple copy and paste, because when he does this, he enters the white space, is ignored. Therefore, my purpose is to create a panel to replace that portion of the webpage with just the right design, there is no way to do this. Or anyway copy and paste text works properly

  Example: 1-) John is going to work today. 2-) Michael is at home but when we copy and paste the HTML tag under the divi tag, the result is: 1-) John is working today. 2) Michael is at home  < / Pre> 
 I hope I can make myself clear. 
 

Wrap new content in a pre tag e.g.

  & lt; Pre & gt; 1-) John is going to work today 2-) Michael is at home & lt; / Pre & gt;  

This will keep the text formatting.