Hey lowkicker, what Minor did is really easy, I think you should stop by the tutorials section to learn a little bit more about the basics of Construct 2.
Minor created two variables (score, object_create) where the score is stored and one where the points that will be added to the score are stored (points), he is using object_create to check if the score is greater or equal to 10, when than happens 10 points are substracted from object_create so that the system can evaluate that condition again. You could skip the usage of the points variable, but it's always better to have variables to store things like that, so you know where things that modify your score or another important things of your game are.
The problem with MY example is that only one instance of the object is created and the condition is never evaluated again.