The threat of Soviet bombers diminished significantly as the Cold War ended, and the number of NORAD alert sites was reduced from its Cold War high of 26.
( ( ( ( ( ( ( The threat ) ( of ( Soviet bombers ) ) ) ( ( diminished significantly ) ( as ( ( the ( Cold War ) ) ended ) ) ) ) , ) and ) ( ( ( the number ) ( of ( NORAD ( alert sites ) ) ) ) ( was ( reduced ( from ( ( its ( Cold ( War high ) ) ) ( of 26 ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN threat)) (PP (IN of) (NP (JJ Soviet) (NNS bombers)))) (VP (VBD diminished) (ADVP (RB significantly)) (SBAR (IN as) (S (NP (DT the) (NNP Cold) (NNP War)) (VP (VBD ended)))))) (, ,) (CC and) (S (NP (NP (DT the) (NN number)) (PP (IN of) (NP (JJ NORAD) (JJ alert) (NNS sites)))) (VP (VBD was) (VP (VBN reduced) (PP (IN from) (NP (NP (PRP$ its) (NNP Cold) (NNP War) (NN high)) (PP (IN of) (NP (CD 26)))))))) (. .)))
After the end of the Cold War, the number of NORAD alert sites plummeted.
( ( After ( ( the end ) ( of ( the ( Cold War ) ) ) ) ) ( , ( ( ( the number ) ( of ( NORAD ( alert sites ) ) ) ) ( plummeted . ) ) ) )
(ROOT (S (PP (IN After) (NP (NP (DT the) (NN end)) (PP (IN of) (NP (DT the) (NNP Cold) (NNP War))))) (, ,) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (JJ NORAD) (JJ alert) (NNS sites)))) (VP (VBD plummeted)) (. .)))