One of my favorite classes in grad school was learning to write about complex topics in a clear and concise way.

Hopefully these reading materials are still useful!

- "Science of Scientific Writing" https://cseweb.ucsd.edu/~swanson/papers/science-of-writing.p...

- "Style: Lessons in Clarity and Grace" https://www.amazon.com/Style-Lessons-Clarity-Grace-10th/dp/0...

William Zinsser's "On Writing Well," a million times over.

Also, Joseph William's "Style: Lessons in Clarity and Grace." http://www.amazon.com/Style-Lessons-Clarity-Grace-10th/dp/02...

I can offer a great alternative:

Style: Lessons In Clarity and Grace by Joseph Williams http://www.amazon.com/Style-Lessons-Clarity-Grace-10th/dp/02...

This book is a simple, step by step guide to making you a better writer. By chapter 2 you're already writing much clearer prose. It's one of those books you want to read every couple of years.

I'd also recommend the essay "Politics and the English Language" by George Orwell:

http://www.mtholyoke.edu/acad/intrel/orwell46.htm