Simplify the following text for a Grade 10 native English-speaking person.
Original: The 2008 Kosovo declaration of independence was an act of the Provisional Institutions of Self-Government Assembly of Kosovo , adopted on 17 February 2008 by unanimous quorum ( 109 members present ) , which declared Kosovo to be independent from Serbia .
Simplified: The declaration of independence was made by members of the Kosovo Assembly meeting in Pristina , the capital of Kosovo , on 17 February 2008 . It was approved by a unanimous quorum , numbering 109 members .