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There is no specific rule about how many words should be there in a easy sentence. As long as the words used are not too complex, not repeating, and are delivering the message clearly, the sentence...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43755 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There is no specific rule about how many words should be there in a easy sentence. As long as the words used are not too complex, not repeating, and are delivering the message clearly, the sentence could be as long as 20 to 40 words (1-2 lines). Focus more on the grammar and punctuation, as they have to be correct for the content to be easily understandable. (I'm considering that the audience of your blog is common public.)