How to use Simplisafe last_event_changed_by to trigger automation

Hello everyone.
I am new to using HA and am feeling like I am missing something when it comes to using my Simplisafe integration to trigger an automation. Specifically, I am looking to use the SIMPLISAFE_EVENT last_event_changed_by event data to trigger an automation. I want to write an automation to trigger the living room lights to turn on when my brother-in-law comes over to let out our dogs. How do I find what data is sent by the simplisafe control panel to use to accomplish this? I have been reading the documentation for the integration here SimpliSafe - Home Assistant and its not making the lightbulb click on in the brain for that AH-HA moment. Does anyone know of where I can find the info I am looking for? Lastly, with trying to integrate this into an automation, do I need to write this into the automation event as python coding as found in the event documentation or can this be wrote using yaml? Thank you in advance for any help!

Go to Developer Tools > Events and listen for SIMPLISAFE_EVENT, trigger the event and see you should be able to see its data. Then make an automation with a trigger that looks something like this:

triggers:
  - trigger: event
    event_type: SIMPLISAFE_EVENT
    event_data:
      last_event_changed_by: "..."

Thank you for your reply. I followed your suggestions and I am still having no luck. I put SIMPLISAFE_EVENT into the listener and I get no return when I arm/disarm the system. However, I did look under Developer Tools > States and I did find the information I think that I needed. Now, I wrote this info into a trigger for my automation, but when I disarm the system using the pin code, it is not triggering the automation. Here is my yaml that I have so far. Am I missing something?

automation:
  triggers:
    - trigger: state
      entity_id:
      - alarm_control_panel.alarm_control_panel
      to: "disarmed"
    - trigger: event
      event_type: SIMPLISAFE_EVENT
      event_data:
        last_event_changed_by: Chuck
        last_event_sensor_type: KEYPAD

Thanks again for your help!
edit I should also mention that I am attempting to edit/re-write an automation that I had setup before using just a canned trigger for when the system was disarmed to trigger the living room lights to turn on. Do I need to delete this automation and just rewrite a new one from scratch?

After messing around with this, I finally got it figured out. Not really sure what I was doing wrong, but it finally clicked once I wrote the whole automation in yaml instead of trying to edit the yaml in the UI. For anyone else who might find this post with the same question, here is my yaml for this automation.

alias: <set.name.of.automation.here>
description: ""
triggers:
    # Trigger automation based off of who disarms the system.
  - trigger: event
    event_type: SIMPLISAFE_EVENT
    event_data:
      #Add name from keypad attributes. Developer Tools -> States, find changed_by.
      last_event_changed_by: <Name>
      last_event_sensor_type: KEYPAD
  - trigger: state
    #Change to entity id of simplisafe control panel if different.
    entity_id: alarm_control_panel.alarm_control_panel
    to: disarmed
conditions: []
actions:
  - action: light.turn_on
    metadata: {}
    data:
      kelvin: 3500
      brightness_pct: 50
    target:
      entity_id: light.ceiling_fan_lights #Set for lights that you want to turn on when triggered by automation.
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