That a sentence is 20 words long is not quite true, because we can easily create sentences that are considerably longer than 20 words, such as this one. But let’s stick to 20 words in a sentence ...

In the words of TED curator Chris Anderson ... Distilling your message into a single sentence will make your writing flow better, and make your key points easier to arrange.

It’s grammatically correct, but the commas have been left out to emphasize the problem with the sentence. As you read about Bob, you add the words to an internal buffer to make up a phrase.

Sentences that are very straightforward barely engage these regions, and nonsensical sequences of words don't do much ... or so complex that they make no sense at all -- evoked very little ...

That a sentence is 20 words long is not quite true, because we can easily create sentences that are considerably longer than 20 words, such as this one. But let’s stick to 20 words in a sentence ...