( They ( also ( ( form ( ( halocarbons , ) ( ( ( ( compounds ( with carbon ) ) and ) often ) ( ( other elements ) ( such ( as ( ( hydrogen and ) oxygen ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (PRP They)) (ADVP (RB also)) (VP (VBP form) (NP (NP (NNS halocarbons)) (, ,) (NP (NP (NP (NNS compounds)) (PP (IN with) (NP (NN carbon)))) (CC and) (ADVP (RB often)) (NP (NP (JJ other) (NNS elements)) (PP (JJ such) (IN as) (NP (NN hydrogen) (CC and) (NN oxygen))))))) (. .)))
They also form halocarbons, compounds with carbon and often other elements such as hydrogen and oxygen.
(ROOT (S (NP (NP (DT The) (NN element) (NN carbon)) (PP (IN on) (NP (DT the) (JJ periodic) (NN table)))) (VP (VBZ forms) (NP (DT the) (ADJP (RBS most) (JJ diverse)) (NNS compounds))) (. .)))