Language parsing has long been a challenge for artificial intelligence, as (contrary to myth) language defies easy formalization. So it's significant that Google has not only developed this tool, but also that they're making it available online. Even better, it has been given a name that properly reflects its seriousness as a research tool: Parsey McParseface. "One of the main problems that makes parsing so challenging is that human languages show remarkable levels of ambiguity. It is not uncommon for moderate length sentences - say 20 or 30 words in length - to have hundreds, thousands, or even tens of thousands of possible syntactic structures. A natural language parser must somehow search through all of these alternatives, and find the most plausible structure given the context." There's a really nice example of this in the article.
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