Simplify the following text for a Grade 8 native English-speaking person.
Original: On the outbreak of the French Revolution in 1789 , Piccinni returned to Naples , where he was at first well received by King Ferdinand IV ; but the marriage of his daughter to a French democrat brought him disgrace - he was accused of being a revolutionary and placed under house arrest for four years .
Simplified: When the French Revolution broke out in 1789 , Piccinni returned to Naples . At first he was warmly welcomed by King Ferdinand IV ; but when his daughter married a French democrat the Neapolitans were angry .