I've done some researching and I found a very helpful article by Daniel Arenson. Four words for you...
Keep It Simple, Stupid!
Or the KISS principle. It is used when creating the premise or foundation of your story. Great novels like Harry Potter can be summarized in a few sentences. Now if you are experiencing difficulties in summarizing your story, it might be too complicated (or you haven't figured out the world, (Later Chapter)) you should apply the KISS principle.
If it is too complicated for you, it is too complicated for your reader!
Just because you can summarize a novel simply, doesn't mean the story is simple. You can develop twist and turns which can slip into the story summary. Your novel should be about the story and characters, not the words you use to describe them.
Now when do you not use the KISS principle? During characterization and setting and description you want to display depth and complexion but with premise and conflict and writing style it is easier for the readers, and you, to stick to the KISS method.
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