Complex sentence: After retiring from WJZ, Sher's presence on the Baltimore airwaves endured, as host of the Sunday morning public affairs forum "Square Off" on WMAR-TV.
Split into simpler sentences: After retiring from WJZ, Sher's presence on the Baltimore airwaves endured. His Sunday morning public affairs forum "Square Off", which he had hosted for many years on WJZ, continued on WMAR-TV.