( ( ( ( Reviews methods ) ( of ( external ( and ( internal stimulation ) ) ) ) ) ( of sales ) ) . )
(ROOT (NP (NP (JJ Reviews) (NNS methods)) (PP (IN of) (NP (JJ external) (CC and) (JJ internal) (NN stimulation))) (PP (IN of) (NP (NNS sales))) (. .)))
Reviews methods of external and internal stimulation of sales.
(ROOT (S (NP (NNS Amphibians)) (ADVP (RB sexually)) (VP (VB reproduce) (PP (IN through) (NP (JJ external) (CC or) (JJ internal) (NN fertilization)))) (. .)))