$("#lastWord").html(function(){ // Class or id can be use
  var text = $("#lastWord").text().split(" "); // All text convert to array.
  var last = text.pop();  // Select last wrod.
  var first = text.shift(); // Select first word.

  var firstW = first.innerHTML = '<span class="firstWord">' + first + '</span>'; // Make wrapper of first wrod
  var lastW = last.innerHTML = '<span class="lastWord">' + last + '</span>'; // Make wrapper of last wrod.

  return firstW + " " + text.join(" ").concat( " " + lastW );
});