( ( The ( knee-jerk reflex ) ) ( ( ( was first ) ( described ( in 1875 ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ knee-jerk) (NN reflex)) (VP (VBD was) (ADVP (RB first)) (VP (VBN described) (PP (IN in) (NP (CD 1875))))) (. .)))
The knee-jerk reflex was first described in 1875.
(ROOT (X (NP (DT The) (`` ``) (JJ knee-jerk) ('' '') (NN motion)) (SBAR (IN that) (S (NP (NNS people)) (ADVP (RB involuntarily)) (VP (VBP perform) (SBAR (IN after) (S (S (VP (VBG being) (VP (VBN struck) (PP (IN in) (NP (NP (DT the) (NN knee)) (PP (IN in) (NP (DT a) (JJ certain) (NN way)))))))) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (DT a) (JJ reflex))))))))))))