While it's probably true that democracies are unlikely to go to war unless they're attacked, sometimes they are the first to take the offensive.
( ( While ( it ( ( ( 's probably ) true ) ( that ( democracies ( are ( unlikely ( to ( ( go ( to war ) ) ( unless ( they ( 're attacked ) ) ) ) ) ) ) ) ) ) ) ) ( , ( sometimes ( they ( ( are ( the ( first ( to ( take ( the offensive ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (SBAR (IN While) (S (NP (PRP it)) (VP (VBZ 's) (ADVP (RB probably)) (ADJP (JJ true)) (SBAR (IN that) (S (NP (NNS democracies)) (VP (VBP are) (ADJP (JJ unlikely) (S (VP (TO to) (VP (VB go) (PP (TO to) (NP (NN war))) (SBAR (IN unless) (S (NP (PRP they)) (VP (VBP 're) (VP (VBN attacked))))))))))))))) (, ,) (ADVP (RB sometimes)) (NP (PRP they)) (VP (VBP are) (NP (DT the) (JJ first) (S (VP (TO to) (VP (VB take) (NP (DT the) (NN offensive))))))) (. .)))
Democracies probably won't go to war unless someone attacks them.
( Democracies ( probably ( ( ( wo n't ) ( ( go ( to war ) ) ( unless ( someone ( attacks them ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNS Democracies)) (ADVP (RB probably)) (VP (MD wo) (RB n't) (VP (VB go) (PP (TO to) (NP (NN war))) (SBAR (IN unless) (S (NP (NN someone)) (VP (VBZ attacks) (NP (PRP them))))))) (. .)))