Help me clean this up

render.js

// This is the render method in the `ItemView` in my Backbone.Marionette plugin.
// It's a giant method - far too much happening in this one method, and poor
// use of memory with all of the methods that get re-defined on every use.
//
// It desperately needs to be cleaned up. But I can't do something quite as
// simple as just move the inner functions on to the ItemView itself. There
// are too many methods on the ItemView already.
//
// Suggestions? What are some good patterns to clean this up?
//
// Fork this gist or otherwise give me some ideas.
//
// Thanks,
//   -Derick

    render: function(){
      var that = this;

      var deferredRender = $.Deferred();

      var beforeRenderDone = function() {
        that.trigger("before:render", that);
        that.trigger("item:before:render", that);

        var deferredData = that.serializeData();
        $.when(deferredData).then(dataSerialized);
      } 

      var dataSerialized = function(data){
        var asyncRender = that.renderHtml(data);
        $.when(asyncRender).then(templateRendered);
      }

      var templateRendered = function(html){
        that.$el.html(html);
        callDeferredMethod(that.onRender, onRenderDone, that);
      }

      var onRenderDone = function(){
        that.trigger("render", that);
        that.trigger("item:rendered", that);

        deferredRender.resolve();
      }

      callDeferredMethod(this.beforeRender, beforeRenderDone, this);

      return deferredRender.promise();
    }