Because there is an official SmartThings/harmony integration, which is there is not for Vera, there are already two simple ways to accomplish this task. I don’t want to hijack this thread, I will give you the links to a harmony topic where you can ask any follow-up questions.
Method one: just include the SmartThings device in the harmony activity
Because the Harmony/SmartThings official integration is Two way, you can already add any device controlled by SmartThings to a harmony activity as a home control device. So you can already just have say a “watch movie activity” which is triggered by your motion sensor also turn your living room lights to dim and turn your hallway light on right in that harmony activity.
So SmartThings sensor turns on Harmony activity which turns on SmartThings light. Two way integration in a single Harmony activity. This requires no custom code at all, it’s just selections from the drop-down boxes in the harmony app. 
Or you could have a “good night activity” in harmony that shuts off your home entertainment system, locks the door, and turns off some lights.
Method two: include a virtual switch in the Harmony activity, and on the SmartThings side have a restricted routine or a smart app subscribe to that switch going on
This is how you would manage something like the “watch movie” activity coming on but only, say, after 6 PM and then have other things happen. That is, anytime you turned on The “watch movie activity” the virtual switch would come on, but you would set up the routine or the smart app to not run unless other conditions were also true. So that’s how you would keep from resetting lights during the daytime.
As I said, both of these are already available. Which one to use just depends on the needs for the specific use case.
Here’s the FAQ on the Harmony/smartthings integration. You could also create your own topic under projects if you want to brainstorm a specific set up.
As far as using rule machine with it, if you need that, the second method would probably be more appropriate. And you would just trigger from the virtual switch Being turned on.