( ( After all ) ( , ( we ( ( 've ( been ( ( taught ( since childhood ) ) ( that ( fructose ( is ( fruit sugar ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN After) (NP (DT all))) (, ,) (NP (PRP we)) (VP (VBP 've) (VP (VBN been) (VP (VBN taught) (PP (IN since) (NP (NN childhood))) (SBAR (IN that) (S (NP (NN fructose)) (VP (VBZ is) (NP (NN fruit) (NN sugar)))))))) (. .)))
After all, we've been taught since childhood that fructose is fruit sugar.
(ROOT (S (NP (NNP Fructose)) (VP (VBZ is) (NP (NP (DT a) (NN sugar)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN found) (PP (IN in) (NP (NNS fruits))))))))) (. .)))