Complex sentence: Cartoon Network ran the "Cartoon Cartoon Fridays" block, where most of their new shows and episodes premiered, for five years, avoiding the "Death Slot" entirely from 1999 to 2004.
Split into simpler sentences: Cartoon Network ran the "Cartoon Cartoon Fridays" block, where most of their new shows and episodes premiered, for five years. Avoiding the "Death Slot" entirely from 1999 to 2004.