又来了,英语句子成分.

Public duty may not necessarily mean details of offical duty主句
although it may include that constant and active practical participation in the details of politics without which,upon the part of the most intelligent citizens,the conduct of public affairs falls under the control of selfish and ignorant or crafty and venal men让步状语从句,其中it may include 是主谓
that constant and active practical participation in the details of politics 是宾语从句,作include的宾语
without which,upon the part of the most intelligent citizens,the conduct of public affairs falls under the control of selfish and ignorant or crafty and venal men是定语从句修饰先行词participation
这个without which...定语从句中upon the part of the most intelligent citizens是对象状语；the conduct of public affairs 是主语；falls under the control of selfish and ignorant or crafty and venal men是系表结构作谓语.
句子意思是：公众的责任未必就是官方责任的详细内容,它也许包括（公众）不断的积极的有效的参与具体的政治,没有他们的参与,对部分有头脑的公民来说,公共事务的行为会变得自私,无知而失去控制,或他们会变成诡计多端和腐败的人