Simplify the following text for a Grade 7 native English-speaking person.
Original: The lawnchair used in the flight was given to an admiring boy named Jerry , though Walters later regretted doing so , since the Smithsonian Institute asked him to donate it to its museum .
Simplified: Larry gave the lawnchair from the flight to a boy named Jerry because the boy liked him . Later , Walters realized that was a mistake when the Smithsonian Institute asked him to donate it to its museum .