1. Some readers will want to take {at a large coeducational college} to either "dean" or "women" as an adjective, while a few might want to take it to "began" as an adverb. Any of the three explanations should be considered as correct, although a class might have an interesting discussion about the differences in meaning.

2. Because "follows" is not a noun or pronoun, "as follows" is not a prepositional phrase. [Don't worry, for now, about what it is -- concentrate on the prepositional phrases.