Simplify the following text for a Grade 8 native English-speaking person.
Original: At the presentation , Walt Disney explained the plans for the site , including EPCOT , the Experimental Prototype Community of Tomorrow , which was to be a futuristic city ( and which was also known as Progress City ) .
Simplified: Epcot was going to be a city when Walt Disney was planning it , but planners changed it to a theme park after his death . The name `` Epcot '' was an acronym for `` Experimental Prototype Community of Tomorrow . ''