Simplify the following text for a Grade 6 native English-speaking person.
Original: After a war lasting six months between the party of Ptolemy XIII and the Roman army of Caesar , Ptolemy XIII was drowned in the Nile and Caesar restored Cleopatra to her throne , with another younger brother Ptolemy XIV as her new co-ruler .
Simplified: Caesar decided to make Cleopatra queen again . Ptolemy did not like that .