( ( ( The density ) ( of ( that ( ( very ( dense matter ) ) ( was ( ( originally ( so high ) ) ( that ( it ( ( was then ) ( ( opaque and ) light ) ) ) ) ) ) ) ) ) ) ( ( ( could not ) ( pass ( through it ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN density)) (PP (IN of) (SBAR (IN that) (S (NP (RB very) (JJ dense) (NN matter)) (VP (VBD was) (ADJP (ADJP (RB originally) (RB so) (JJ high)) (SBAR (IN that) (S (NP (PRP it)) (VP (VBD was) (RB then) (ADJP (JJ opaque) (CC and) (JJ light))))))))))) (VP (MD could) (RB not) (VP (VB pass) (PP (IN through) (NP (PRP it))))) (. .)))
The density of that very dense matter was originally so high that it was then opaque and light could not pass through it.
(ROOT (S (NP (NNP Opaque)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NN matter))) (SBAR (WHNP (WDT that)) (S (VP (VBZ does) (RB not) (VP (VB let) (NP (DT any) (JJ light) (NN pass)) (PRT (RP through)))))))) (. .)))