A simple sentence uses a subject and a verb..
Complex (APEX)
Like this; I am an architect.
i went on an expedition
i am a dissident
I am unsympathetic to your need.
i think politicaly
The field had boundaries.
This is a logging road.
This is simple question. It may be answered in a simple sentence; He responded politely.
Okay... Here's a simple one... When I turn 21 I will contribute in politics. Simple and lame but it's a sentence right?
My drivers' license is valid.
We were pleased to partake of their simple meal.