Complex sentence: Censorinus ("De Die Natali", c.18) considers Cleostratus to have been the real inventor of the octaeteris, or cycle of eight years, which was used befote the Metonic cycle of 19 years, and which was populary attributed to Eudoxus.
Split into simpler sentences: Censorinus ("De Die Natali", c.18) considers Cleostratus to have been the real inventor of the octaeteris, or cycle of eight years. The octaeteris used before the Metonic cycle of 19 years, and was populary attributed to Eudoxus.