Simplify the following text for a Grade 9 native English-speaking person.
Original: Korea , Liechtenstein , and Turkey returned after having missed the 1952 Winter Olympics , while Argentina , Denmark , New Zealand , and Portugal did not compete at these Games , after having participated in the previous edition .
Simplified: Korea , Liechtenstein , and Turkey returned after having missed the 1952 Winter Olympics . Argentina , Denmark , New Zealand , and Portugal did not compete at these Games , after participating in 1952 .