The difference between knowledge and communication
I was in a presentation the other day in which the presenter knew her subject extremely well. She spoke quickly, used a lot of arcane words I'd never heard, and a plenty of acronyms. There was little opportunity for questions, probably because the speaker was much too busy talking about what she knew.
I bet the audience didn't understand 10% of what she said. That's too bad, because we'd invested an hour of our lives to be there.
Spouting knowledge is not communicating. Communicating is sharing knowledge, but to do it, you need focus not on the knowledge itself, but on the people to whom you're communicating the knowledge. You need to focus on the audience.
Know your audience. Know what they're likely to know about your subject, and what they probably don't know. Adjust your terminology accordingly.
Slowly introduce what will be new to them, and explain why that new knowledge matters. Tell them what you're going to share with them, and why they should care; why it may improve their day, change their lives, or make the world a better place.
Then explain it in plain simple English. It may take longer to prepare a presentation in more simplified language, but it's worth it, especially if you want your ideas to stick. Mark Twain was famous for saying, "I'd have written you a shorter letter, if I had more time."
After each idea or concept, ask the audience if it makes sense.