Complex sentence: Later, he launched "Premiere Magazine Live!", a weekly radio show about movies, in approximately 50 markets countrywide, with he and his wife, using the on-air name Karen Walters, working together as hosts.
Split into simpler sentences: Later, he launched "Premiere Magazine Live!", a weekly radio show about movies, in approximately 50 markets countrywide. He and his wife, who went by the on-air name Karen Walters, worked together as hosts.