( ( The theory ) ( ( produces ( a ( great deal ) ) ) but ) )
(ROOT (S (NP (DT The) (NN theory)) (VP (VBZ produces) (NP (DT a) (JJ great) (NN deal)) (ADVP (CC but)))))
The theory produces a great deal but
(ROOT (S (NP (DT A) (NN theory)) (VP (VBZ is) (NP (NP (DT another) (NN name)) (PP (IN for) (NP (NP (DT a) (JJ broad) (NN explanation)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN supported) (PP (IN by) (NP (NP (DT a) (JJ great) (NN deal)) (PP (IN of) (NP (NN evidence))))))))))))) (. .)))