The phrase "attended of which" is not correct and does not make sense in written English.
It seems to be an incorrect combination of words that does not convey a clear meaning.
Example: "The conference, attended of which were many experts, was a great success." (This example is incorrect.)
Alternatives: "attended by" or "which was attended by".
Of those invited we anticipate about 50% will attend, of which about two-thirds will be interested in taking part in the research study.
McKellen attended Bolton School Boys Divisionof), of which he is still a supporter, attending regularly to talk to pupils.
Today, approximately 7 million Afghan children attend school, of which 2.6 million, or roughly a third, are girls.
This is no cheap deal, with tickets for the gala night costing up to £840 each for the 5,000 people attending, 1,300 of which stay for dinner at further cost.
Information on cognition was available for 664 patients (376 patients assessed with MMSE, 288 patients assessed by the attending doctor), of which 20.2% showed signs of minor cognitive impairment and 67.8% were moderately to severely impaired.
Rats attend to the light signaling which of two response alternatives will produce a reinforcer; people attend to the wheels on a slot-machine because they signal when money is won; researchers attend to which of the granting agencies is in political favor because that shapes the flavor of the application.
He then attended Malvern College and Tonbridge School, both of which he despised and left after a few terms.
The Annals of the Four Masters states that 13,000 horsemen attended the meeting 1,000 of which were supplied from Dublin.
Only five physicians attended the meeting of which only two finally participated in the study.
Concerning the educational status of mothers, 371 61.0%) had attended formal school of which 275(45.2%) completed primary school (grade1-8).
