as the novel on which it 's based 
(ROOT (PP (IN as) (NP (NP (DT the) (NN novel)) (SBAR (WHPP (IN on) (WHNP (WDT which))) (S (NP (PRP it)) (VP (VBZ 's) (VP (VBN based))))))))
(ROOT (PP (IN ) (NP (NP (DT ) (NN )) (SBAR (WHPP (IN ) (WHNP (WDT ))) (S (NP (PRP )) (VP (VBZ ) (VP (VBN ))))))))