Simplify the following text for a Grade 12 native English-speaking person.
Original: Karachi Division ( Urdu : Ø Ù Ø Ù Ú Ú Ø Ø Ú Û ) was a former administrative division of the Sindh Province of Pakistan , which included the Karachi District and Malir District until the reforms of 2000 abolished the third tier of government .
Simplified: Karachi Division was an administrative division of the Sindh Province of Pakistan , until the reforms of 2000 abolished the third tier of government .