Dow's theory is very simple, there is no grammar that is difficult to translate, and any version can be read. The key is your own understanding.

See what your starting point is. If you want to know something about Dow's theory, Chen Dong's translation is more useful. If you want to know the core philosophical points, I suggest you look at the Principles of Computerized Technical Analysis of Securities and Futures Investment written by Bobo. The second chapter introduces the connotation of Dow theory.