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))))))))))))) (. .)))
Iraq retaliated against the air attacks soon after the U.S. operation.
( Iraq ( ( ( retaliated ( against ( the ( air attacks ) ) ) ) ( soon ( after ( the ( U.S. operation ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Iraq)) (VP (VBD retaliated) (PP (IN against) (NP (DT the) (NN air) (NNS attacks))) (PP (ADVP (RB soon)) (IN after) (NP (DT the) (NNP U.S.) (NN operation)))) (. .)))