なぜ倒置になっているのかがわかりません
His style was far from being recondite, but full of preciosity of banal or abstruse words he had learned in New England--Which was always anathema to me, together with his sybaritic life in contrast to bucolic nomad life depicted in the picture he treasured in the corridor wall. Besides, he was being fractious most of the time--rarely was he effusive in his flow of emotion while all day long, was he phlegmatic like vegetable. No wonder nobody would give countenance to his position at that time.
'rarely' に続く箇所が倒置になっていますよね?どうしてなのでしょうか?初歩的な質問かもしれませんがどうぞよろしくお願いします。