( ( ( Stay away ) ( from ( ( three-leaf plants ) ( that ( look ( like ( poison ( ivy ( or ( poison oak ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Stay) (ADVP (RB away)) (PP (IN from) (NP (NP (JJ three-leaf) (NNS plants)) (SBAR (WHNP (WDT that)) (S (VP (VBP look) (PP (IN like) (NP (JJ poison) (NN ivy) (CC or) (NN poison) (NN oak))))))))) (. .)))
Stay away from three-leaf plants that look like poison ivy or poison oak.
(ROOT (S (NP (NN Poison) (NN ivy)) (ADVP (RB typically)) (VP (VBZ has) (NP (NP (CD three) (NNS groups)) (PP (IN of) (NP (NNS leaves))))) (. .)))