Simplify the following text for a Grade 5 native English-speaking person.
Original: Odysseus ' plan called for one man to remain outside of the horse ; he would act as though the Greeks abandoned him , leaving the horse as a gift for the Trojans .
Simplified: The Greeks built a large wooden horse and left it outside the gates of the city as a present for the Trojans . The Trojans took the horse and put it inside their city , thinking it was a victory gift from the Greeks .