Simplify the following text for a Grade 6 native English-speaking person.
Original: The Lieutenancies Act 1997 ( 1997 c. 23 ) is an Act of Parliament in the United Kingdom , that defines areas that Lord-Lieutenants are appointed to in Great Britain .
Simplified: The Lieutenancies Act 1997 ( 1997 c. 23 ) is an Act of Parliament in the United Kingdom .