Complex sentence: Pinwheel was relaunched as Nickelodeon on April 1,1979, despite its prior history on the QUBE system under the Pinwheel name, Nickelodeon designated 1979 as the channel's official launch year.
Split into simpler sentences: Pinwheel was relaunched as Nickelodeon on April 1,1979. Despite its prior history on the QUBE system under the Pinwheel name, Nickelodeon designated 1979 as the channel's official launch year.