Effective writing is often characterised by simplicity and George Orwell’s rules for writing are as relevant as they were 50 years ago:
I think the following rules will cover most cases:
(i) Never use a metaphor, simile, or other figure of speech which you are used to seeing in print.
(ii) Never us 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.