Simplify the following text for a Grade 13 native English-speaking person.
Original: When the Holy Roman Empire was dissolved following the defeat of Emperor Francis II by Napoleon at the Battle of Austerlitz , the electorate was raised to the status of an independent kingdom with the support of France , then the dominant power in Central Europe .
Simplified: When Emperor Francis II was defeated by Napoleon at the Battle of Austerlitz and the empire was dissolved the electorate became an independent kingdom .