Complex sentence: Following the September 11,2001 attacks upon the United States, Pakistani President Pervez Musharraf announced his support for the U.S.-led War on Terror, sparking conflict with the Lal Masjid, whose leadership was openly pro-Taliban.
Split into simpler sentences: Following the September 11,2001 attacks on the United States, Pakistani President Pervez Musharraf announced his support for the U.S.-led War on Terror. This declaration sparked conflict with the Lal Masjid, whose leadership was openly pro-Taliban.