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Sentence Complexity Analyzer
A sentence complexity analyzer tells you where your prose sits on the simple-to-complex spectrum — and, unlike a single readability score, it keeps the two ingredients visible so you can see which one is driving the rating. It measures exactly two things: average words per sentence, and the share of long words (seven letters or more). Text under 12 words per sentence with under 15% long words rates Simple; under 20 and 25% rates Moderate; anything above rates Complex. Both figures are reported alongside the verdict, plus the sentence count. Complexity is not a defect — academic and literary prose is often deliberately dense — but the measures here are deliberately blunt: the tool counts lengths, it does not parse grammar, so a long sentence of short plain words still registers as complex. Use it directionally. If the rating surprises you, the two stats tell you whether to cut sentence length, vocabulary weight, or both.
How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Paste your text into the box.
- Click Generate to analyse complexity.
- Check the rating and stats.
- Shorten long sentences to simplify.
Use Cases
- •Editing for your audience
- •Checking if writing is too dense
- •Simplifying technical prose
- •Matching tone to a reader
- •A quick style gut-check
Tips
- →Watch your average sentence length.
- →Match complexity to your audience.
- →Break one long sentence into two.
- →Read it aloud to feel the rhythm.
FAQ
what exactly does the analyzer measure
Two figures: average words per sentence, and the percentage of words that are seven letters or longer. Under 12 words per sentence with under 15% long words rates Simple, under 20 and 25% rates Moderate, and anything above rates Complex. Both numbers appear with the verdict so you can see which one drove it.
is complex writing bad
Not inherently — it depends on your audience and purpose. Academic or literary writing is often deliberately complex, while web copy and instructions should be simple. The goal is to match your complexity to the reader, not to always minimize it.
does it understand grammar or clause structure
No — the analysis is purely length-based. A rambling 30-word sentence of short plain words rates Complex, while a compact sentence stuffed with dense jargon can rate Simple. Treat the verdict as a pointer at sentence length and vocabulary weight, and judge structure yourself.
how does this differ from a readability score checker
A readability score like Flesch Reading Ease combines sentence length and word length into one number calibrated to a school grade level. This analyzer keeps those two dimensions separate, showing average sentence length and the proportion of long words as distinct figures. That split makes it easier to pinpoint whether complexity comes from sprawling sentences, dense vocabulary, or both.
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