He notified his supervisor, who passed the notice up the chain of command.
( He ( ( notified ( ( ( his supervisor ) , ) ( who ( ( passed ( the notice ) ) ( up ( ( the chain ) ( of command ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD notified) (NP (NP (PRP$ his) (NN supervisor)) (, ,) (SBAR (WHNP (WP who)) (S (VP (VBD passed) (NP (DT the) (NN notice)) (PP (IN up) (NP (NP (DT the) (NN chain)) (PP (IN of) (NP (NN command)))))))))) (. .)))
The notice was passed up the chain of command by the supervisor. 
( ( The notice ) ( ( was ( ( ( passed up ) ( ( the chain ) ( of command ) ) ) ( by ( the supervisor ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN notice)) (VP (VBD was) (VP (VBN passed) (PRT (RP up)) (NP (NP (DT the) (NN chain)) (PP (IN of) (NP (NN command)))) (PP (IN by) (NP (DT the) (NN supervisor))))) (. .)))