By 10:45 there was, however, another set of fighters circling Washington that had entirely different rules of engagement.
( ( By 10:45 ) ( there ( ( ( ( ( was , ) however ) , ) ( ( another set ) ( of ( fighters ( circling ( Washington ( that ( had ( ( ( entirely different ) rules ) ( of engagement ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN By) (NP (CD 10:45))) (NP (EX there)) (VP (VBD was) (, ,) (ADVP (RB however)) (, ,) (NP (NP (DT another) (NN set)) (PP (IN of) (NP (NP (NNS fighters)) (VP (VBG circling) (NP (NP (NNP Washington)) (SBAR (WHNP (WDT that)) (S (VP (VBD had) (NP (NP (ADJP (RB entirely) (JJ different)) (NNS rules)) (PP (IN of) (NP (NN engagement))))))))))))) (. .)))
The fighters in the air over Washington at 10:45 had been told specific rules of engagement. 
( ( ( The fighters ) ( in ( ( the air ) ( over ( Washington ( at 10:45 ) ) ) ) ) ) ( ( had ( been ( told ( ( specific rules ) ( of engagement ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS fighters)) (PP (IN in) (NP (NP (DT the) (NN air)) (PP (IN over) (NP (NP (NNP Washington)) (PP (IN at) (NP (CD 10:45)))))))) (VP (VBD had) (VP (VBN been) (VP (VBN told) (NP (NP (JJ specific) (NNS rules)) (PP (IN of) (NP (NN engagement))))))) (. .)))