“I am tired of struggling to translate their non-logical Japanese drafts into English.”
すると、相手は「え?どういうこと?」と訊いてくることになるので、後から説明する。例えば、
“They are non-trained writers employed as engineers by a private company, and their drafts are not written logically enough to understand. I suppose they are self-complacent with their drafts and never imagine how hard it is to translate them into English.”