Jon saw him ride into the smoke.
( Jon ( ( saw ( him ( ride ( into ( the smoke ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Jon)) (VP (VBD saw) (SBAR (S (NP (PRP him)) (VP (VBP ride) (PP (IN into) (NP (DT the) (NN smoke))))))) (. .)))
He rode off into the smoke as Jon watched.
( He ( ( ( ( rode off ) ( into ( the smoke ) ) ) ( as ( Jon watched ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD rode) (PRT (RP off)) (PP (IN into) (NP (DT the) (NN smoke))) (SBAR (IN as) (S (NP (NNP Jon)) (VP (VBD watched))))) (. .)))