( ( ( Classify substances ) ( such ( as ( elements ( , ( ( compounds and ) mixtures ) ) ) ) ) ) ( ( based ( on ( their properties ) ) ) . ) )
(ROOT (S (NP (NP (JJ Classify) (NNS substances)) (PP (JJ such) (IN as) (NP (NNS elements) (, ,) (NNS compounds) (CC and) (NNS mixtures)))) (VP (VBN based) (PP (IN on) (NP (PRP$ their) (NNS properties)))) (. .)))
Classify substances such as elements, compounds and mixtures based on their properties.
(ROOT (S (NP (NP (NNS Substances)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN broken) (PRT (RP down)) (PP (IN into) (NP (NP (JJR simpler) (NNS substances)) (PP (IN with) (NP (JJ different) (NNS properties))))))))))) (VP (VBP are) (VP (VBN called) (NP (NNS elements)))) (. .)))