Simplify the following text for a Grade 8 native English-speaking person.
Original: George Andrew Romero ( born February 4 , 1940 ) is an American-Canadian film director , screenwriter , and editor best known for his gruesome and satirical horror films about a hypothetical zombie apocalypse .
Simplified: George Andrew Romero ( born February 4 , 1940 ) is an American director , writer , editor and actor . He is known for his horror movies with zombie themes .