One of London Zoo's recent advertisements caused me some irritation, so patently did it distort reality.
I don't know what to do to understand this phrase..
I guessed this sentence as "The advertisement caused me irritation. It distorted reality." I'm not sure.
But I don't know how it can be 1 sentence. And What is the meaning and usage of "so patently did"? I know 'patently' means 'obviously'.