Simplify the following text for a Grade 7 native English-speaking person.
Original: Vibeke 's children were of course the natural enemies of the children of Kirsten Munk , and the hatred of the two families was not without influence on the future history of Denmark .
Simplified: Vibeke 's children were of course the natural enemies of the children of Kirsten Munk . The anger of the two families influenced the future history of Denmark .