One day the Nouns were clustered in the street. An Adjective walked by, with her dark beauty.
The May 2007 SAT. Section 6, question 24 has the following question:
After the uprising of October 10, 1911, that has led to the establishment of a Chinese republic, many Chinese Americans decided to return to China in hopes of a bright future there. No error
Do you see the problem?
The constituency problem, as Jangari correctly noted, concerns the prepositional phrase "with the solemn precision of scientists articulating chemical equations." The original diagramming indicates that the "we" of the sentence are learning with precision, but it seems much more natural to assume that it is the diagramming that occurs with precision. In other words, the PP modifies diagram, not learned.
That said, there are irritating errors in the book.