by Chelsey Cooley Sat Sep 12, 2015 12:53 am
The "touch rule" for modifiers that begin with wh words (like "who") is one of those rules that works brilliantly 90% of the time and can be very powerful, but isn't an absolute law. (Kind of like the rule in Quant that says you can always solve for two variables if you have two equations - it works really well, right up until you run into a DS problem that's been specifically designed to exploit it.)
Luckily, the exceptions are pretty easy to spot. The GMAT considers it okay to have a single, very short modifier - which will almost always, in my experience, be a prepositional phrase modifier - between a noun and a 'wh' modifier, as long as the meaning is completely clear. Thus, this is okay:
The portrait of the Queen, which used to hang on my wall, was stolen yesterday.
And so is your example.