By the autumn of 1993, U.S. commanders concluded that the main source of trouble was a warlord, Mohammed Farrah Aidid.
( ( By ( ( the autumn ) ( of 1993 ) ) ) ( , ( ( U.S. commanders ) ( ( concluded ( that ( ( ( the ( main source ) ) ( of trouble ) ) ( was ( ( ( a warlord ) , ) ( Mohammed ( Farrah Aidid ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN By) (NP (NP (DT the) (NN autumn)) (PP (IN of) (NP (CD 1993))))) (, ,) (NP (NNP U.S.) (NNS commanders)) (VP (VBD concluded) (SBAR (IN that) (S (NP (NP (DT the) (JJ main) (NN source)) (PP (IN of) (NP (NN trouble)))) (VP (VBD was) (NP (NP (DT a) (NN warlord)) (, ,) (NP (NNP Mohammed) (NNP Farrah) (NNP Aidid))))))) (. .)))
US commanders decided Aidid was the biggest source of trouble.
( ( US commanders ) ( ( decided ( Aidid ( was ( ( the ( biggest source ) ) ( of trouble ) ) ) ) ) . ) )
(ROOT (S (NP (NNP US) (NNS commanders)) (VP (VBD decided) (SBAR (S (NP (NNP Aidid)) (VP (VBD was) (NP (NP (DT the) (JJS biggest) (NN source)) (PP (IN of) (NP (NN trouble)))))))) (. .)))