Complex sentence: The channel originally launched on February 9,1989 and officially launched on September 1 of that year as SportsChannel Ohio, an affiliate of SportsChannel, a joint venture between Cablevision and NBC.
Split into simpler sentences: The channel originally launched on February 9,1989, with an official launch on September 1 of that year as SportsChannel Ohio. It launched as an affiliate of SportsChannel, a slate of regional sports networks operated as a joint venture between Cablevision and NBC.