The last 12 years of his life are a blank.
( ( ( The ( last ( 12 years ) ) ) ( of ( his life ) ) ) ( ( are ( a blank ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ last) (CD 12) (NNS years)) (PP (IN of) (NP (PRP$ his) (NN life)))) (VP (VBP are) (NP (DT a) (JJ blank))) (. .)))
He spent the last 12 years of his life in an alcoholic blackout
( He ( ( spent ( ( the ( last ( 12 years ) ) ) ( of ( his life ) ) ) ) ( in ( an ( alcoholic blackout ) ) ) ) )
(ROOT (S (NP (PRP He)) (VP (VBD spent) (NP (NP (DT the) (JJ last) (CD 12) (NNS years)) (PP (IN of) (NP (PRP$ his) (NN life)))) (PP (IN in) (NP (DT an) (JJ alcoholic) (NN blackout))))))