moore provides an invaluable service by sparking debate and encouraging thought . 
(ROOT (S (NP (NNP moore)) (VP (VBZ provides) (NP (DT an) (JJ invaluable) (NN service)) (PP (IN by) (S (VP (VP (VBG sparking) (NP (NN debate))) (CC and) (VP (VBG encouraging) (NP (NN thought))))))) (. .)))
(ROOT (S (NP (NNP )) (VP (VBZ ) (NP (DT ) (JJ ) (NN )) (PP (IN ) (S (VP (VP (VBG ) (NP (NN ))) (CC ) (VP (VBG ) (NP (NN ))))))) (. )))