How Can we remove the HTML from string and return an object from it

I have a string which looks like

var str = <strong>Result completed.</strong> This has been done by user steve at 2am

Now, from this string I would like to remove the strong as well as , I am trying divide this string in two parts,

{
  title: "Result completed.",
  desc: "This has been done by user steve at 2am"
}

So , is there any way I can get this result using javascript

Thanks