There is conflicting evidence about when the Vice President arrived in the shelter conference room.
( There ( ( is ( ( conflicting evidence ) ( about ( when ( ( the ( Vice President ) ) ( arrived ( in ( the ( shelter ( conference room ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ is) (NP (NP (VBG conflicting) (NN evidence)) (PP (IN about) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NNP Vice) (NNP President)) (VP (VBD arrived) (PP (IN in) (NP (DT the) (NN shelter) (NN conference) (NN room))))))))) (. .)))
It is uncertain when the Vice President arrived.
( It ( ( ( is uncertain ) ( when ( ( the ( Vice President ) ) arrived ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADJP (JJ uncertain)) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NNP Vice) (NNP President)) (VP (VBD arrived))))) (. .)))