trust me, it's exagerrated.
The key word in the sentence is SIMPLY.
the sentence says (paraprhased): the scientists took the fact that the protein is simply folded for granted.
*to take for granted means to underestimate the value of.
so, they were underestimating that the protein in simply folded. Which means they were underestimating the simpleness of it, and thus exagerrating it's intricacy.
hopefully my logic isn't completely screwed
but ah well, it's just the SAT.