Complex sentence: Jamaat-ul-Ahrar is the second splinter group to break away from the Tehreek-i-Taliban in Pakistan on September 4,2014 and named Omar Khalid Khorasani as its commander.
Split into simpler sentences: Jamaat-ul-Ahrar is a splinter group of Tehreek-i-Taliban in Pakistan. The breakaway Jamaat ul Ahrar group announced its split on September 4,2014 and named Omar Khalid Khorasani as its commander.