GMAT Sentence Correction (SC) | Re: In 1984 medical researchers at Harvard and Stanford ...

As posted previously by folks, I have the same query.

In 1984 medical researchers at Harvard and Stanford universities concluded that sedentary life-styles lead to heart and lung diseases that shorten lives, strongly recommending middle-aged people to undertake some form of regular exercise.

The -ING modifier modifiers 'researchers'.

MR, strongly recommending blah blah blah, concluded that sedentary life-styles lead to heart and lung diseases.

And recommendation can likely be assumes as a