( ( ( This ( oxidative ( stress theory ) ) ) ( of aging ) ) ( ( is ( supported ( by ( ( a ( great deal ) ) ( of evidence ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT This) (JJ oxidative) (NN stress) (NN theory)) (PP (IN of) (NP (VBG aging)))) (VP (VBZ is) (VP (VBN supported) (PP (IN by) (NP (NP (DT a) (JJ great) (NN deal)) (PP (IN of) (NP (NN evidence))))))) (. .)))
This oxidative stress theory of aging is supported by a great deal of evidence.
(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))))))))))))) (. .)))