This is often said about Richard Feynman and how he could distill incredibly complex questions down into simple thoughtful answers that left you satisfied but more curious. I think we get a capable (but not quite the same) modern version with Neil deGrasse Tyson.

It's definitely something you can learn though, it just takes practice. Take a complex topic and summarize it to yourself in shorter and shorter sentences. Or browse ELI5 (explain like I'm five) on Reddit for some good amateur responses.