Huh? It is in plain language. It contains a dependent clause (...militia...) and an independent clause (..right of the people...). From grade school English, you will remember that the meaning of an independent clause is not modified by a dependent clause. Anybody who took grade school English should be able to understand it. Only people who choose to lie about its meaning "misunderstand" it.
You wouldn't simply repeat it word for word. You'd rephrase in simple, plain language that anyone could understand.