For example, people who believe that aggression is necessary and justified--as during wartime--are likely to act aggressively, whereas people who believe that a particular war or act of aggression is unjust, or who think that aggression is never justified, are less likely to behave aggressively. (45, OG)托福查分

aggression n. 侵略

justified adj. 合理的，正当的

unjust adj. 不公正的，不公平的

我是分界线，先自己分析哦。

For example, people (who believe that aggression is necessary and justified--as during wartime--) are likely to act aggressively, whereas people (who believe that a particular war or act of aggression is unjust), or (who think that aggression is never justified), are less likely to behave aggressively.

分析：

修饰一：(who believe that aggression is necessary and justified--as during wartime--)，从句，修饰people，注意里面还有一个从句(that aggression is necessary and justified)

中文：相信侵略是必要的合理的(诸如战争时期)

修饰二：(who believe that a particular war or act of aggression is unjust) ，从句，修饰people，注意里面还有一个从句(that a particular war or act of aggression is unjust)

中文：相信一场特别的战争或侵略行为是不公正的人们

修饰三：(who think that aggression isnever justified)，从句，修饰people，

中文：认为侵略从来不是合理的人们

主干部分：表示对比的句子：people are likely to act aggressively whereas people are less likely to behave aggressively.

参考翻译：

例如，相信侵略是必要的合理的(诸如战争时期)的人们就有可能行为有侵略性;然而，相信一场特别的战争或侵略行为是不公正的，或者，认为侵略从来不是合理的人们，就少有可能行为有侵略性。

这个句子的主要修饰成分就是从句，大家务必想清楚，每一个修饰成分修饰的是什么，才能看清楚这个句子的结构。