A TLDR:
He argues that political language is banal, often couched in pretentious, sophisticated-sounding phrases which amount to nothing, but sound profound to the inattentive listener. Instead, we should communicate clearly and directly. If politicians did this, “…when you make a stupid remark its stupidity will be obvious, even to yourself. Political language – and with variations this is true of all political parties, from Conservatives to Anarchists – is designed to make lies sound truthful and murder respectable, and to give an appearance of solidity to pure wind.”
And here are his rules to follow:
i. Never use a metaphor, simile or other figure of speech which you are used to seeing in print.
ii. Never use a long word where a short one will do.
iii. If it is possible to cut a word out, always cut it out.
iv. Never use the passive where you can use the active.
v. Never use a foreign phrase, a scientific word or a jargon word if you can think of an everyday English equivalent.
vi. Break any of these rules sooner than say anything outright barbarous.