Simplify the following text for a Grade 12 native English-speaking person.
Original: Although heavily outnumbered , the Greek Allies were persuaded by the Athenian general Themistocles to bring the Persian fleet to battle again , in the hope that a victory would prevent naval operations against the Peloponessus .
Simplified: Although heavily outnumbered , the Greek Allies were persuaded by the Athenian general Themistocles to bring the Persian fleet to battle again .