Dude your dumb.
You can leave your headset and splitter intact by doing it like this:
Cut the 2 audio cable's ( red/white ) from the audo video cable and make 2 3,5 mm plugs on them. Plug them in the splitter.
Use a jack to jack cable and plug the splitter in one jack and the audio cable from your headset into the other side of the cable in the jack.
Cut the yellow videocable and connect the a jack. Plug the 3,5 mm from your mic of your headset in that one.
This way you can leave the headset and the splitter intact. And you only need to cut the wires of the audio video cable.
There will be a How to Next week on this website made by badg0r