The idiom 返璞归真 is formed by combining two parallel verb-object phrases: 返璞 (return to simplicity) and 归真 (return to truth). 返 means "to return", 璞 means "uncut jade" or "natural state", 归 means "to return", and 真 means "truth" or "original essence". The structure uses synonymous actions and objects to reinforce the idea of reverting to an unadorned, genuine condition.