nested timeline using createJS.

gistfile1.txt

var timeline = new createjs.Timeline([], { start: 0 }, { paused: true });
var timeline2 = new createjs.Timeline([], { start: 0 }, { paused: true });

timeline.addTween(
  createjs.Tween.get(ellipse).to({ x: 100 }, 500, createjs.Ease.cubicOut),
  createjs.Tween.get(ellipse2).to({ y: 100 }, 500, createjs.Ease.cubicOut).call(function(){
    timeline2.gotoAndPlay('start');
  })
);
timeline2.addTween(
  createjs.Tween.get(ellipse).to({ y: 100 }, 500, createjs.Ease.cubicOut),
  createjs.Tween.get(ellipse2).to({ x: 100 }, 500, createjs.Ease.cubicOut)
);

timeline.gotoAndPlay("start");