I was interested in the sentence “After reviewing the special commissioner's report, it is obvious to me that Mr. Namnum abused his responsibility and privileges to secure a job for his wife, who was clearly unqualified,” which appeared in news article, titled “School Administrator Resigns After Inquiry Into Wife's Job,” on The New York Times (March 28, 2012).
The schools chancellor, Dennis M. Walcott, issued a statement saying: "After reviewing the special commissioner's report, it is obvious to me that Mr. Namnum abused his responsibility and privileges to secure a job for his wife, who was clearly unqualified. No one at any level of government should be allowed to put his own self-interest ahead of his obligation to the city."
For a non-native English speaker, it seems more natural rewording the mentioned sentence in this way: "A review of the special commissioner's report provides evidence that Mr. Namnum abused ...".
Are there rules governing this strange grammatical structure (After reviewing ..., it ...)?