This is an excerpt from a piece of text talking about ambiguity:
Misuse of the word which, or its omission for brevity, both produce many classic examples of amphiboly. (“On the claim form I have filled in details about the injury to my spine which I now enclose.”)
There are innumerable versions of the advertisement:
FOR SALE: Car by elderly lady with new body and spare tyre.
How do the two examples the author gives here support his view about amphiboly?
In the first example, I can only figure out one meaning, and in the second one, I can’t even understand the grammatical or syntactic structure, much less its meaning.