3.As a result，claims that eating a diet consisting entirely of organically grown foods prevents or cures disease or provides other benefits to health have become widely publicized 宣傳 and form the basis 基礎for folklore.民間
(同位語從句claims that…)
結果，那些認為只食用綠色食品就能防治疾病或增進健康的觀點廣為人知，并成為一些民間說法的基礎。
分句 1： that eating a diet consisting entirely of organically grown foods prevents or cures disease or provides other benefits to health
分句2：claims have become widely publicized and form the basis for folklore
分句2嵌套分句1，分句1作為分句2主語的同位語從句嵌套在分句2中。因此本句的主句是 claims have become widely publicized and form the basis for folklore. 那些觀點廣為人知，并成為一些民間說法的基礎。同位語從句是 that eating a diet consisting entirely of organically grown foods prevents or cures disease or provides other benefits to health：只食用綠色食品就能防治疾病或增進健康