Synthesized answer
The provided passages do not contain the answer to how to explain the key concepts of "On Protracted War" in my own words. The passages only include the title of the work and its author [1]. There is no additional content that explains the key concepts or provides information that would allow for such an explanation.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: On Protracted War by Zedong Mao Categories: China Pages: 134