This was the question:
What is wrong with this sentence? "He's been tracking criminals with a microscope for quite a number of years."It's wordy. 11 (10%)
A phrase is in the wrong place. 36 (34%)
Something is spelled wrong. 0 (0%)
Two of the above. 40 (38%)
None of the above. 18 (17%)
Congrats to 38% of you. "Quite a number of years" is a wordy way of saying "many years." In addition, a phrase is in the wrong place: "with a microscope." You could interpret this sentence to mean that the criminals have a microscope, instead of the He of the sentence. It would not be ambiguous, or wordy, to say this:
"For many years, he's used a microscope to track criminals."