( ( more loosely ) ( , ( ( many carbon-based ) ( ( compounds ( that ( also ( contain ( other elements ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RBR more) (RB loosely)) (, ,) (NP (JJ many) (NN carbon-based)) (VP (VBZ compounds) (SBAR (IN that) (S (ADVP (RB also)) (VP (VBP contain) (NP (JJ other) (NNS elements)))))) (. .)))
more loosely, many carbon-based compounds that also contain other elements.
(ROOT (S (NP (NP (NNS Compounds)) (VP (VBG containing) (NP (DT the) (NN element) (NN carbon)))) (VP (VBP are) (NP (NP (DT the) (NN basis)) (PP (IN of) (NP (DT all) (VBN known) (NN life))))) (. .)))
Compounds containing the element carbon are the basis of all known life.