The only thing I know about Gilbert is that I find him listed as co-author of Muskrat Ramble .
( ( ( The ( only thing ) ) ( I ( know ( about Gilbert ) ) ) ) ( ( is ( that ( I ( find ( him ( listed ( as ( co-author ( of ( Muskrat Ramble ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ only) (NN thing)) (SBAR (S (NP (PRP I)) (VP (VBP know) (PP (IN about) (NP (NNP Gilbert))))))) (VP (VBZ is) (SBAR (IN that) (S (NP (PRP I)) (VP (VBP find) (S (NP (PRP him)) (VP (VBN listed) (PP (IN as) (NP (NP (NN co-author)) (PP (IN of) (NP (NNP Muskrat) (NNP Ramble))))))))))) (. .)))
The only knowledge I have about Gilbert is his co-authorship of Muskrat Ramble.
( ( ( The ( only knowledge ) ) ( I ( have ( about Gilbert ) ) ) ) ( ( is ( ( his co-authorship ) ( of ( Muskrat Ramble ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ only) (NN knowledge)) (SBAR (S (NP (PRP I)) (VP (VBP have) (VP (PP (IN about) (NP (NNP Gilbert)))))))) (VP (VBZ is) (NP (NP (PRP$ his) (NN co-authorship)) (PP (IN of) (NP (NNP Muskrat) (NNP Ramble))))) (. .)))