The phrase "which approved of" is correct and usable in written English.
You can use it when referring to a person who has previously given approval for something. For example: He made the decision to go ahead with the project, which was approved of by his supervisor.
He had been nominated to the vice-presidency largely to placate the "stalwart" wing of the Republican party, which approved of such patronage.
They submitted the petition to the Gram Panchayat, which approved of their request, and a month later, their two-room school became a three-room school.
The Naval Court of Inquiry, which approved of all of Admiral Kimmel's force dispositions, found that he committed no errors of judgment and that he had done everything possible under the circumstances.
First, I agree with the Court insofar as its decision, which approves of only one racial classification, confirms that further use of race in admissions remains unlawful.
If the tax, which represented a seventy-per-cent increase for France's richest citizens, was surprising to Hollande's advisers, it was tantalizing to the French public, sixty per cent of which approves of a supertax.
According to the Insurance Institute for Highway Safety -- which approves of the technology partly as a way to reduce highway accidents -- motorists running red lights, for example, cause about 800 deaths each year.
Furthermore, such developments are not out of line with the views of the majority of the public which approves of clear rules being imposed on the media in relation to the publication of private information (see the 2010 Reuters report, "Privacy Probity and the Public Interest", discussed by us here).
But the White House, which approves of the plan's overall goals, made an important concession on Wednesday by agreeing to consider a brief increase in the debt ceiling if all parties showed some willingness to compromise on a longer-term plan structured like that of the Gang of Six.
Cuomo recently signed the farm cideries bill, which approves of proper licensing for NY farm cideries to generate more booze.
The study was approved by the participating centres' institutional review boards, each of which approved waiver of consent for this retrospective study, and also was approved by the National Death Index review board.
This imposition on Lloyds came courtesy of the European Commission, which approved £17bn of "state recapitalisation" during the financial crisis, providing the group shed some of its bulk.
