Complex sentence: KTLA still airs the new parade, but it aired on a tape-delayed basis on December 16,2007 due to KTLA's 60th Anniversary celebration which occurred on the weekend of the Parade.
Split into simpler sentences: KTLA still airs the new parade on a tape-delayed basis. It last aired December 16,2007 due to KTLA's 60th Anniversary celebration which occurred on the weekend of the Parade.