Simplify the following text for a Grade 9 native English-speaking person.
Original: Then called Urbs Dei or The Two Fatherlands , the poem described how a Christian owes his loyalties to both his homeland and the heavenly kingdom .
Simplified: At first called Urbs Dei , or The Two Fatherlands , the poem is about how a Christian owes her loyalties to both her homeland and the Kingdom of Heaven .