( Air ( ( ( is actually ) ( ( a mixture ) ( of ( ( ( several ( different elements ) ) and ) compounds ) ) ) ) . ) )
(ROOT (S (NP (NNP Air)) (VP (VBZ is) (ADVP (RB actually)) (NP (NP (DT a) (NN mixture)) (PP (IN of) (NP (NP (JJ several) (JJ different) (NNS elements)) (CC and) (NP (NNS compounds)))))) (. .)))
Air is actually a mixture of several different elements and compounds.
(ROOT (S (NP (NNP Air)) (VP (MD can) (VP (VB be) (VP (VBN separated) (PP (IN into) (NP (JJ several) (NNS elements)))))) (. .)))