Difference between Oversimplification and Simplism

What is the difference between Oversimplification and Simplism?

Oversimplification as a noun is an explanation that excludes important information for the sake of brevity, or of making the explanation or presentation easy to understand. while Simplism as a noun is the trait of oversimplifying things by ignoring complexity and complications

We hope you now know whether to use Oversimplification or Simplism in your sentence.