Here is a simple triangle choke setup when your opponent is inside your guard with a knee in the middle. The follow up sweep when they try to stop it is very simple.
The equipment I use

Canon 80D https://amzn.to/2MBDHSV

Zoom H6 https://amzn.to/30yiew3

Rode Videomic Pro https://amzn.to/2SaNgY8

Manfrotto 502 Video Head MVH502AH https://amzn.to/2k2QTm7

Manfrotto 055 Aluminum 3-Section Tripod with Horizontal Column (MT055XPRO3)
https://amzn.to/2lqx2xD

The Smartphone Gimbal I use. DJI Osmo 2 https://amzn.to/2SPJvYq

The mic I use for Gimbal: https://amzn.to/2LMss8P

The flashlight I carry – Streamlight Pro-Tac 2L-X 500 lumen https://amzn.to/2jYM1P2

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Triangle chokes are great, but triangle choke setups is what allows you to actually get into that submission in the first place. Here’s my current favorite setup! Also, have you downloaded my BJJ checklist yet? You can get it for free at http://www.grapplearts.com/book. And you can get more two-on-one techniques from Rob Biernacki at https://www.bjjconcepts.net