It depends on whether you wish to make money from your writing.
Typically best selling novels are written at a 7th grade reading level (i.e. what an average 13 to 14 year old actively attending school can read without effort).
If you don't know what that is, I suggest you find some best-sellers in your genre (may be found free in a library, or cheap in a used book store), and try to analyze the writing by reading random pages in the book.
When analyzing the writing of others, it is best to not get immersed in the story, your imagination will interfere with your rational analysis. Just pick a page at random and see how complex the sentences are.
The more sophisticated your prose style, the more complex your sentences and paragraphs get, the more likely you are to be rejected by agents and/or publishers.
I'm not saying you cannot do it; but publishers do not like to take risks. They know their market, they know what people buy, they know what a bestseller looks like -- and they often don't care if they miss a gem, they stick to their knitting. Publishing a book that doesn't break any market rules of thumb is risky enough, thank you.
Them's the rules, brudda, if you want to sell.