There was confusion at that moment in the FAA.
( There ( ( was ( confusion ( at ( ( that moment ) ( in ( the FAA ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBD was) (NP (NP (NN confusion)) (PP (IN at) (NP (NP (DT that) (NN moment)) (PP (IN in) (NP (DT the) (NNP FAA))))))) (. .)))
The FAA understood completely what was happening.
( ( The FAA ) ( ( ( understood completely ) ( what ( was happening ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP FAA)) (VP (VBD understood) (ADVP (RB completely)) (SBAR (WHNP (WP what)) (S (VP (VBD was) (VP (VBG happening)))))) (. .)))