One of my college journalism teachers told me to write my stories so my grandmother could understand them. His point was that stories need to be written so that anyone can read and comprehend them.
How do you write a complex story in a way that my grandmother (or yours) can understand?
Take a lot of notes when you interview your subject matter expert or source. Even if you don’t use all of them in the story, they will aid your comprehension.
Use Google to help with your understanding. If the person you interviewed used words and terms you don’t know, Google them. If it still doesn’t make sense, find a video that might explain the concept.
Distill the information. In other words, keep digging until you can boil the story down to a few key points. From that you can build your and the reader’s understanding by adding layers to the story.
Find the holes. As you build the story, identify any holes and find the missing information. You may have to call your source back or complete additional research.
Write to make people interested. Ultimately, you are telling a story. What is that first attracted you to the story? Why do you want to tell it? If you keep those questions top of mind as you research and write, you will interest others in reading the story.