Complex sentence: Repeats of the original "Double Dare" continued to air on Nickelodeon until March 15,1991 and returned Nickelodeon's schedule again from June 12,1994 to September 30,1994.
Split into simpler sentences: Repeats of the original "Double Dare" continued to air on Nickelodeon until March 15,1991. Repeats returned to Nickelodeon's schedule again from June 12,1994 to September 30,1994.