Complex sentence: Blatty appealed it to the Supreme Court, which declined to hear the case, thus the lower court ruling stood that the list is editorial content, not objective factual content--the "Times" had the right to exclude books from the list.
Split into simpler sentences: Blatty appealed it to the Supreme Court, which declined to hear the case. Thus, the lower court ruling stood that the list is editorial content, not objective factual content, so the "Times" had the right to exclude books from the list.