Simplify the following text for a Grade 10 native English-speaking person.
Original: Ahtisaari was a UN Special Envoy at the Kosovo status process negotiations , aimed at resolving a long-running dispute in Kosovo , which declared its independence from Serbia in 2008 .
Simplified: Ahtisaari was a UN Special Envoy at the Kosovo status process negotiations . These negotiations were aimed at resolving a long-running dispute in Kosovo .