There are some simple maxims [...] which I think might be commanded to writers of expository prose. First: never use a long word if a short word will… - Bertrand Russell

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There are some simple maxims [...] which I think might be commanded to writers of expository prose. First: never use a long word if a short word will do. Second: if you want to make a statement with a great many qualifications, put some of the qualifications in separate sentences. Third: do not let the beginning of your sentence lead the reader to an expectation which is contradicted by the end.