"Hillary Clinton was running for president knowing all too well that a woman has to be twice as qualified to be perceived as once as good."
I'm confused by the sentence in bold. There's so many as...as...as...
I racked my brains, read it over and over again, still I don't get it.
I roughly know it means in order to be perceived as good and qualified as a man, a woman has to work twice harder?
What I don't understand is how these as work with each other (I mean how to explain these as?)
and what does once mean in the sentence? Is it like once, twice and thrice?