( They ( ( think ( it ( ( ( is ( ( based entirely ) ( upon ( subjective interpretation ) ) ) ) and ) ( ( do not ) ( realize ( it ( is ( based ( upon ( ( objective facts ) ( -LRB- ( ( which ( then ( demand ( an explanation ) ) ) ) -RRB- ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP think) (SBAR (S (NP (PRP it)) (VP (VP (VBZ is) (VP (VBN based) (ADVP (RB entirely)) (PP (IN upon) (NP (JJ subjective) (NN interpretation))))) (CC and) (VP (VBP do) (RB not) (VP (VB realize) (SBAR (S (NP (PRP it)) (VP (VBZ is) (VP (VBN based) (PP (IN upon) (NP (NP (JJ objective) (NNS facts)) (PRN (-LRB- -LRB-) (SBAR (WHNP (WDT which)) (S (ADVP (RB then)) (VP (VBP demand) (NP (DT an) (NN explanation))))) (-RRB- -RRB-)))))))))))))) (. .)))
They think it is based entirely upon subjective interpretation and do not realize it is based upon objective facts (which then demand an explanation).
(ROOT (S (NP (PDT All) (NP (JJ scientific) (NNS explanations)) (CC and) (NP (NNS interpretations))) (VP (VBN based) (PP (IN on) (NP (NNS facts)))) (. .)))