Simplify the following text for a Grade 4 native English-speaking person.
Original: The Alexandrian Life of Aeschylus claims that he won the first prize at the City Dionysia thirteen times .
Simplified: All of the surviving plays won first prize at the City Dionysia . One book , the Alexandrian Life of Aeschylus , said that he won the first prize at the City Dionysia 13 times .