The adopted use of trained fighter horses, which some historians date during early Ottoman rule, was a critical element to the expansion of the Ottoman Empire.
The adopted use of trained fighter horses, which some historians date
The adopted use of trained fighter horses, which some historians have thought to occur
Adopting the use of trained fighter horses, dated by some historians
The adoption of using trained fighter horses, thought by some historians to have occurred
The trained fighter horse's adopted use, dated by some historians
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So how should you be looking at this GMAT sentence correction question? Well, you should spot the two commas in the sentence. The keyword "which"s should also tell you to cut the fluff here.
You can read the sentence like so:
"The adopted use of trained fighter horses, which [blah blah blah], was the key to [blah blah blah]"
So far was see the word WAS and the subject as "The adopted use" - so we have subject verb agreement where the singular subject matches with the word WAS.
We keep going...
source: GMAT Pill
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