The Vice Chairman joined the conference shortly before 10:00; the Secretary, shortly before 10:30.
( ( The ( Vice Chairman ) ) ( ( ( ( joined ( the conference ) ) ( shortly ( before ( ( 10:00 ; ) ( ( ( the Secretary ) , ) shortly ) ) ) ) ) ( before 10:30 ) ) . ) )
(ROOT (S (NP (DT The) (NNP Vice) (NNP Chairman)) (VP (VBD joined) (NP (DT the) (NN conference)) (PP (RB shortly) (IN before) (NP (NP (CD 10:00)) (: ;) (NP (NP (DT the) (NNP Secretary)) (, ,) (ADVP (RB shortly))))) (PP (IN before) (NP (CD 10:30)))) (. .)))
The NSA did not join until around 11 am.
( ( The NSA ) ( ( ( did not ) ( join ( until ( around ( 11 am ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP NSA)) (VP (VBD did) (RB not) (VP (VB join) (PP (IN until) (NP (RB around) (CD 11) (RB am))))) (. .)))