All three come from public texts. The analysis was made by the product's own pipeline and is shown as it came out after a native reviewer passed it. Follow the link to see the structure drawn on the tool page.
A contract clause: unless hides the condition at the end
The tenant must give the landlord written notice at least thirty days before moving out, unless the lease ends earlier.
Where readers get stuckBy the time you reach unless, the obligation has already been read, and many readers skip the rest as a side note.
Walk-throughThe trunk is “the tenant must give the landlord written notice”. At least thirty days answers “how many days at least”; before moving out answers “before what”. Then unless the lease ends earlier is a condition that rewrites the whole sentence: if the lease ends early, the obligation no longer applies. In a contract, cue words like unless, provided that and except must always be read to the end.
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A news sentence: the real content comes after estimate that
Scientists estimate that an impact of this magnitude happens on the Moon about once in a century or even longer.
Where readers get stuckScientists estimate looks like the trunk, but it only says who is estimating.
Walk-throughThe that in estimate that opens the content of the estimate: “an impact of this magnitude happens” is what the sentence is really about. The two parts after it each answer one question. Where? On the Moon. How often? About once in a century or even longer. Once you see that, you know where the real content begins.