Practice, exposure to people who speak in a more normal way. I have the opposite problem, I always describe stuff in plain English, and highly educated types tend to find it really funny hearing me talk about complicated academic subjects in a way they are not used to.

To make myself stand out less and be taken more seriously by these kinds of people, I practice explaining things in my head when I'm doing boring stuff like cleaning around the house. Like, just pick a subject and start lecturing about it. Even if it's a little incoherent and badly structured, it's practice.