The good news is that the teen-age birth rate has fallen almost 9 percent since 1991.
( ( The ( good news ) ) ( ( is ( that ( ( the ( teen-age ( birth rate ) ) ) ( has ( ( fallen ( almost ( 9 percent ) ) ) ( since 1991 ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ good) (NN news)) (VP (VBZ is) (SBAR (IN that) (S (NP (DT the) (JJ teen-age) (NN birth) (NN rate)) (VP (VBZ has) (VP (VBN fallen) (NP (RB almost) (CD 9) (NN percent)) (PP (IN since) (NP (CD 1991)))))))) (. .)))
The teen birth rate has fallen since 1991, which is good news.
( ( The ( teen ( birth rate ) ) ) ( ( has ( fallen ( since ( ( 1991 , ) ( which ( is ( good news ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ teen) (NN birth) (NN rate)) (VP (VBZ has) (VP (VBN fallen) (PP (IN since) (NP (NP (CD 1991)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (JJ good) (NN news))))))))) (. .)))