Simplify the following text for a Grade 7 native English-speaking person.
Original: In 490 BC , Aeschylus and his brother Cynegeirus fought to defend Athens against Darius ' invading Persian army at the Battle of Marathon .
Simplified: In 490 BC the Persian army , led by Darius , landed in Greece and tried to take it over . Aeschylus , and his brother Cynegeirus , joined the army from Athens and fought against the Persians at the Battle of Marathon .