I would probably set it up something like:
Triggers:
motion1 == active
motion1 != active
motion2 == active
motion2 != active
IF motion1 == active OR motion2 == active
THEN doMyCoolThing()
ELSE turnTheLightsOff()
So basically have triggers for anytime either of the the motion sensors change state (either to active or to not active).
Then the IF condition in the flow could be to make sure either sensor is active before doing your main action in the THEN. And if neither of the sensors were active, then both of them must be inactive, right? In that case, you could run your ‘end’ action there.
(Another approach would be to use multiple IF conditions in a row with different conditions if that’s more intuitive to you or better meets your needs)
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One thing to keep in mind is that all triggers are effectively OR’ed together since they are always events.
IF conditions are used to check the state of one or more things. So even if something wasn’t part of the event that triggered the rule, the rule will figure out what current state the item(s) are in so it can evaluate the IF condition.
By default, IF conditions are AND’ed together (eg. when ALL of the conditions are met), but you can change the IF condition to OR (eg. when ANY of the conditions are met).