One opportunist who stayed was Octavius Decatur Gass.
( ( One ( opportunist ( who stayed ) ) ) ( ( was ( Octavius ( Decatur Gass ) ) ) . ) )
(ROOT (S (NP (CD One) (NN opportunist) (SBAR (WHNP (WP who)) (S (VP (VBD stayed))))) (VP (VBD was) (NP (NNP Octavius) (NNP Decatur) (NNP Gass))) (. .)))
Octavius described himself as an opportunist often. 
( Octavius ( ( ( ( described himself ) ( as ( an opportunist ) ) ) often ) . ) )
(ROOT (S (NP (NNS Octavius)) (VP (VBD described) (NP (PRP himself)) (PP (IN as) (NP (DT an) (NN opportunist))) (ADVP (RB often))) (. .)))