Democracy is government of the people, by the people, for the people.

Literal

Democracy as-for [topic-とは], people's, people by [agent-による], people for [purpose-のための] politics/government [copula-である].

A Japanese rendering of Lincoln's famous Gettysburg Address line. とは is the defining topic marker — 'as for X, ...' — used when giving a definition. The three parallel modifiers people's / by the people / for the people are rendered with の、による、のための — the three ways Japanese can attach a prepositional modifier to a noun: possessive の, agentive による, benefactive のため.