In 1998, Iraq was under intensifying U.S. pressure, which culminated in a series of large air attacks in December.
( ( In 1998 ) ( , ( Iraq ( ( was ( under ( ( ( intensifying ( U.S. pressure ) ) , ) ( which ( culminated ( in ( ( a series ) ( of ( ( large ( air attacks ) ) ( in December ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (CD 1998))) (, ,) (NP (NNP Iraq)) (VP (VBD was) (PP (IN under) (NP (NP (VBG intensifying) (NNP U.S.) (NN pressure)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBN culminated) (PP (IN in) (NP (NP (DT a) (NN series)) (PP (IN of) (NP (NP (JJ large) (NN air) (NNS attacks)) (PP (IN in) (NP (NNP December))))))))))))) (. .)))
In the late 1990s, the U.S. launched a series of air attacks on Iraq.
( ( In ( the ( late 1990s ) ) ) ( , ( ( the U.S. ) ( ( ( launched ( ( a series ) ( of ( air attacks ) ) ) ) ( on Iraq ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (JJ late) (NNS 1990s))) (, ,) (NP (DT the) (NNP U.S.)) (VP (VBD launched) (NP (NP (DT a) (NN series)) (PP (IN of) (NP (NN air) (NNS attacks)))) (PP (IN on) (NP (NNP Iraq)))) (. .)))