Complex sentence: He stayed in the territory for close on four years before returning to Detroit under the name Bob Stanlee, where he wrestled with real life brothers Steve Stanlee and Gene Stanlee, before moving on to Toronto for promoter Frank Tunney.
Split into simpler sentences: He stayed in the territory for close on four years before heading north. A brief return to Detroit under the name Bob Stanlee, then onto Toronto for promoter Frank Tunney.