Complex sentence: Led by Muslim Atayev, a group of Balkars trained in the Chechen warlord Ruslan Gelayev's camp in Pankisi Gorge in Georgia and upon their return they formed the Yarmuk Jamaat in 2002.
Split into simpler sentences: Led by Muslim Atayev, a group of Balkars trained at the Chechen warlord Ruslan Gelayev's camp in Pankisi Gorge, Georgia. Upon their return they formed the Yarmuk Jamaat in 2002.