Making a marker is a complicated task, even with modern computer assistance.
( ( Making ( a marker ) ) ( ( is ( ( ( a ( complicated task ) ) , ) ( even ( with ( modern ( computer assistance ) ) ) ) ) ) . ) )
(ROOT (S (S (VP (VBG Making) (NP (DT a) (NN marker)))) (VP (VBZ is) (NP (NP (DT a) (JJ complicated) (NN task)) (, ,) (RRC (ADVP (RB even)) (PP (IN with) (NP (JJ modern) (NN computer) (NN assistance)))))) (. .)))
A mistake in the marker spells trouble for the rest of the production.
( ( ( A mistake ) ( in ( the marker ) ) ) ( ( spells ( trouble ( for ( ( the rest ) ( of ( the production ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN mistake)) (PP (IN in) (NP (DT the) (NN marker)))) (VP (VBZ spells) (NP (NP (NN trouble)) (PP (IN for) (NP (NP (DT the) (NN rest)) (PP (IN of) (NP (DT the) (NN production))))))) (. .)))