Complex sentence: The Islamic Emirate of Afghanistan, was established in 1996 and the Afghan capital was transferred to Kandahar, where it held control of most of the country until being overthrown by the American-led invasion of Afghanistan in December 2001, following the September 11 attacks.
Split into simpler sentences: The Islamic Emirate of Afghanistan was established in 1996 and the Afghan capital transferred to Kandahar. It held control of most of the country until being overthrown by the American-led invasion of Afghanistan in December 2001 following the September 11 attacks.