They knew American 77 was lost.
( They ( ( knew ( ( American 77 ) ( was lost ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD knew) (SBAR (S (NP (NNP American) (CD 77)) (VP (VBD was) (VP (VBN lost)))))) (. .)))
They had knowledge of American 77's condition.
( They ( ( had ( knowledge ( of ( ( American ( 77 's ) ) condition ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD had) (NP (NP (NN knowledge)) (PP (IN of) (NP (NP (NNP American) (CD 77) (POS 's)) (NN condition))))) (. .)))