Complex sentence: After the split up of the magazine editor-in-chief Mike Salmon went on to start the "Official Xbox Magazine" while some of the staff was sent to "PC Gamer"; others went on to work for Daily Radar.
Split into simpler sentences: After the split up of the magazine, editor-in-chief Mike Salmon went on to start the "Official Xbox Magazine". While some of the staff was sent to "PC Gamer", others went on to work for Daily Radar.