Parental oversight and involvement in children's TV viewing are essential for two reasons.
( ( ( Parental ( ( oversight and ) involvement ) ) ( in ( ( children 's ) ( TV viewing ) ) ) ) ( ( are ( essential ( for ( two reasons ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Parental) (NN oversight) (CC and) (NN involvement)) (PP (IN in) (NP (NP (NNS children) (POS 's)) (NN TV) (NN viewing)))) (VP (VBP are) (ADJP (JJ essential) (PP (IN for) (NP (CD two) (NNS reasons))))) (. .)))
Two reasons exist for why parents should keep track of what their children watch.
( ( Two reasons ) ( ( exist ( for ( why ( parents ( should ( keep ( track ( of ( what ( ( their children ) watch ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (CD Two) (NNS reasons)) (VP (VBP exist) (PP (IN for) (SBAR (WHADVP (WRB why)) (S (NP (NNS parents)) (VP (MD should) (VP (VB keep) (NP (NP (NN track)) (PP (IN of) (SBAR (WHNP (WP what)) (S (NP (PRP$ their) (NNS children)) (VP (VBP watch)))))))))))) (. .)))