( Knowledge ( ( ( ( is ( like ( ( ( a luminescence ) , ) ( a ( spreading light ) ) ) ) ) , ) ( but ( one ( that ( is ( produced ( by ( ( ( mechanisms or ) realities ) ( that ( are ( of ( ( completely different ) natures ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Knowledge)) (VP (VBZ is) (PP (IN like) (NP (NP (DT a) (NN luminescence)) (, ,) (NP (DT a) (JJ spreading) (NN light)))) (, ,) (PRN (CC but) (NP (NP (CD one)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN produced) (PP (IN by) (NP (NP (NNS mechanisms) (CC or) (NNS realities)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (PP (IN of) (NP (ADJP (RB completely) (JJ different)) (NNS natures))))))))))))))) (. .)))
Knowledge is like a luminescence, a spreading light, but one that is produced by mechanisms or realities that are of completely different natures.
(ROOT (S (NP (NP (NNP Producing) (NN light)) (PP (IN without) (NP (DT a) (JJ high) (NN temperature)))) (VP (VBZ is) (VP (VBN called) (S (ADJP (JJ luminescence))))) (. .)))