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 Secretary and Vice Chairman joined by 10:30 am.
( ( The ( Secretary ( and ( Vice Chairman ) ) ) ) ( ( joined ( by ( 10:30 am ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Secretary) (CC and) (NNP Vice) (NNP Chairman)) (VP (VBD joined) (PP (IN by) (NP (CD 10:30) (RB am)))) (. .)))