I found myself designing presentations in the beautiful world of protein synthesis recently. This is a very complex field of science and diagrams that researchers use reflect that.
While it takes decades of study and research to discover and develop them, the mechanism of action of these drugs can be explained relatively easily. The key is to forget about all the conventional diagramming approaches you see in scientific papers. Leave out any piece of science that is not relevant to the problem that causes the disease, and the way the drug solves it.
I actually start with writing down what the key steps are. Then just visualising what is written down, and not a detail more. The resulting diagrams are unusual and I often get feedback from medical professionals that it all is too simple. A great compliment I think.