You will need something like this
https://amazon.com/MillSO-Splitter-Headphone-Nintendo-Smartphones/dp/B0788M8W77/ref=sr_1_1?ie=UTF8&qid=1531609313&sr=8-1&keywords=ctia+mic+split&tag=hawk-future-20&ascsubtag=UUacUvbUpU6284061
That takes a TRS mic line and a TRS headphone line and combines it...