Simplify the following text for a Grade 6 native English-speaking person.
Original: A polis ( Ï Ï Î '' Î Ï ) means a city , a city-state and also citizenship and body of citizens .
Simplified: Polis ( Ï Ï Î '' Î Ï , , ) , plural poleis ( , Ï Ï Î '' Î Î Ï ) , literally means city in Greek . It could also mean citizenship and body of citizens .