Complex sentence: The characters first appeared in 1993 as a recurring segment on "Animaniacs" and then from 1995 to 1998, they were spun off into their own show on The WB Television Network, "Steven Spielberg Presents Pinky and the Brain", with 65 episodes produced.
Split into simpler sentences: The characters first appeared in 1993 as a recurring segment on "Animaniacs". From 1995 and 1998, they were spun off into their own show on The WB Television Network, "Steven Spielberg Presents Pinky and the Brain", with 65 episodes produced.