Simplify the following text for a Grade 8 native English-speaking person.
Original: In 1993 , the newly independent Slovakia introduced its own koruna , replacing the Czechoslovak koruna at par .
Simplified: The Slovak Crown or Slovak Koruna ( in Slovak , SlovenskÃ koruna , `` koruna '' means crown ) has been the currency used in Slovakia since February 8 , 1993 . It replaced the Czechoslovak Crown .