My friend, a punster, spotted the fact that the plate nicely violated the no  offensive  plates rule.
( ( ( ( ( My friend ) , ) ( a punster ) ) , ) ( ( ( spotted ( the fact ) ) ( that ( ( the plate ) ( nicely ( violated ( the ( ( no offensive ) ( plates rule ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (PRP$ My) (NN friend)) (, ,) (NP (DT a) (NN punster)) (, ,)) (VP (VBD spotted) (NP (DT the) (NN fact)) (SBAR (IN that) (S (NP (DT the) (NN plate)) (ADVP (RB nicely)) (VP (VBD violated) (NP (DT the) (ADJP (RB no) (JJ offensive)) (NNS plates) (NN rule)))))) (. .)))
The no offensive plates rule was violated by the plate noticed by my friend.
( ( The ( ( no offensive ) ( plates rule ) ) ) ( ( was ( violated ( by ( ( the plate ) ( noticed ( by ( my friend ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (ADJP (RB no) (JJ offensive)) (NNS plates) (NN rule)) (VP (VBD was) (VP (VBN violated) (PP (IN by) (NP (NP (DT the) (NN plate)) (VP (VBN noticed) (PP (IN by) (NP (PRP$ my) (NN friend)))))))) (. .)))