This is a 80 year old who presented to the ED with abdominal pain.
 The patient complains of no pain
(ROOT (S (NP (DT This)) (VP (VBZ is) (NP (NP (DT a) (ADJP (CD 80) (NN year) (JJ old))) (SBAR (WHNP (WP who)) (S (VP (VBD presented) (PP (TO to) (NP (DT the) (NN ED))) (PP (IN with) (NP (JJ abdominal) (NN pain)))))))) (. .)))
(ROOT (S (NP (DT The) (NN patient)) (VP (VBZ complains) (PP (IN of) (NP (DT no) (NN pain))))))
( This ( ( is ( ( a ( 80 ( year old ) ) ) ( who ( ( presented ( to ( the ED ) ) ) ( with ( abdominal pain ) ) ) ) ) ) . ) )
( ( The patient ) ( complains ( of ( no pain ) ) ) )