( Stars ( ( ( are initially ) ( formed ( from ( ( ( ( the ( diffuse ( interstellar medium ) ) ) ( -LRB- ( ISM -RRB- ) ) ) , ) ( which ( consists ( of ( ( gas ( and ( small ( dust grains ) ) ) ) ( of ( condensed material ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Stars)) (VP (VBP are) (ADVP (RB initially)) (VP (VBN formed) (PP (IN from) (NP (NP (NP (DT the) (JJ diffuse) (NN interstellar) (NN medium)) (PRN (-LRB- -LRB-) (NP (NNP ISM)) (-RRB- -RRB-))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ consists) (PP (IN of) (NP (NP (NN gas) (CC and) (JJ small) (NN dust) (NNS grains)) (PP (IN of) (NP (JJ condensed) (NN material)))))))))))) (. .)))
Stars are initially formed from the diffuse interstellar medium (ISM), which consists of gas and small dust grains of condensed material.
(ROOT (S (NP (JJ Interstellar) (NN medium)) (VP (VBZ consists) (PP (IN of) (NP (NP (RB thinly) (NN spread) (NN gas)) (CC and) (NP (NN dust))))) (. .)))