Complex sentence: One of the oldest schools in Afghanistan is the Habibia High School in Kabul, which was established by King Habibullah Khan in 1903 to educate students from the nation's elite class.
Split into simpler sentences: One of the oldest schools in Afghanistan is the Habibia High School in Kabul. It was established by King Habibullah Khan in 1903 and helped educate students from the nation's elite class.