<p>While I was practicing writing portion of the SAT, I came across this unclear sentence, which is said to be correct on Mcgraw Hill’s Sat Practice tests. </p>
<p>Geoffrey Ballard, whose renown as a pioneer in the field of fuel-cell technology almost equals that of William Grove, the inventor of the world’s first fuel cell, is the founder of Ballard Power Systems. </p>
<p>Isn’t this incorrect? It sounds really awkward.</p>
<p>It is grammatically correct</p>
<p>Shouldn’t there be “who” inserted in between “cell,” and “is”?</p>
<p>Geoffrey Ballard, whose renown as a pioneer in the field of fuel-cell technology almost equals that of William Grove, the inventor of the world’s first fuel cell, “who” is the founder of Ballard Power Systems.</p>
<p>No, because “, whose renown as a pioneer in the field of fuel-cell technology almost equals that of William Grove, the inventor of the world’s first fuel cell,” is a nonrestrictive clause. Just read the sentence without the words between the commas and you’ll easily see that it should be “Geoffrey Ballard is the founder of Ballard Power Systems”, as it is now.</p>