( ( If ( ( a child ) ( can ( ( ( explain it ) ( to ( a parent ) ) ) then ) ) ) ) ( ( that child ) ( ( has ( ( a ( ( fairly good ) grasp ) ) ( of ( ( the concepts ) ( behind ( the activity ) ) ) ) ) ) . ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT a) (NN child)) (VP (MD can) (VP (VB explain) (NP (PRP it)) (PP (TO to) (NP (DT a) (NN parent))) (ADVP (RB then)))))) (NP (DT that) (NN child)) (VP (VBZ has) (NP (NP (DT a) (ADJP (RB fairly) (JJ good)) (NN grasp)) (PP (IN of) (NP (NP (DT the) (NNS concepts)) (PP (IN behind) (NP (DT the) (NN activity))))))) (. .)))
If a child can explain it to a parent then that child has a fairly good grasp of the concepts behind the activity.
(ROOT (S (NP (NNP Children)) (VP (VBP resemble) (NP (PRP$ their) (NNS parents)) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP have) (NP (JJ similar) (NN dna)))))) (. .)))