Complex sentence: His commercial radio career saw him spend 6 years at Radio Hallam in Sheffield (where he also appeared from time to time on the regional ITV station Yorkshire Television), BRMB in Birmingham, RAM FM in Derby and Leicester Sound.
Split into simpler sentences: His commercial radio career saw him spend 6 years at Radio Hallam in Sheffield (where he also appeared from time to time on the regional ITV station Yorkshire Television). He also worked for BRMB in Birmingham, RAM FM in Derby and Leicester Sound.