Complex sentence: Many newspapers and many magazines rely on their astrology column to boost their circulation significantly, and the few experiments by anti-astrology editors at excluding the columns have tipped the balance-sheet, so that "Your Stars" had to be quickly reinstated.
Split into simpler sentences: Many newspapers and magazines rely on their astrology column to boost their circulation significantly. The few experiments by anti-astrology editors at excluding the columns have tipped the balance-sheet, so that horoscopes had to be quickly reinstated.