All understood the plane had been hijacked.
( All ( ( understood ( ( the plane ) ( had ( been hijacked ) ) ) ) . ) )
(ROOT (S (NP (DT All)) (VP (VBD understood) (SBAR (S (NP (DT the) (NN plane)) (VP (VBD had) (VP (VBN been) (VP (VBN hijacked))))))) (. .)))
As soon as it was announced, all understood that the plane was hijacked.
( ( As ( soon ( as ( it ( was announced ) ) ) ) ) ( , ( all ( ( understood ( that ( ( the plane ) ( was hijacked ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB As) (RB soon) (SBAR (IN as) (S (NP (PRP it)) (VP (VBD was) (VP (VBN announced)))))) (, ,) (NP (DT all)) (VP (VBD understood) (SBAR (IN that) (S (NP (DT the) (NN plane)) (VP (VBD was) (VP (VBN hijacked)))))) (. .)))