Complex sentence: His restaurant became an instant success and has since grown into the current branch in Qianmen that employs over 400 staffs and can occupy 900 guests at one time, among many other Quanjude branches to form one of the largest food enterprises in the nation.
Split into simpler sentences: His restaurant became an instant success and has since grown into the current branch in Qianmen that employs over 400 staff members and can occupy 900 guests at one time. The Qianmen restaurant, along with the many other Quanjude branches, form one of the largest food enterprises in the nation.