Which sentence's style is most appropriate with respect to clarity and simplicity of language?

For centuries, art admirers have been digging through records of the painting to figure out its meaning.

The intricacies of an abstract work of art are seldom comprehended by art enthusiasts.

War campaigns are almost always rumored to be perpetrated with an ulterior motive in play.

Political campaigners usually designate a major fraction of the monetary contributions received toward publicity programs.