Complex sentence: Upon his arrival, he requested all forces in the Valley and along the Allegheny ridges south of Winchester formerly under General Robert E. Lee, and was given his old Stonewall Brigade and General Loring's Division, which were fully not fully assembled until Christmas of 1861.
Split into simpler sentences: Upon his arrival, he requested command of all forces in the Valley and along the Allegheny ridges south of Winchester formerly under General Robert E. Lee. He was given his old Stonewall Brigade and General Loring's Division, which were fully not fully assembled until Christmas of 1861.