Complex sentence: The festival is observed in most Tamil homes and every Tamil temple of Tamil Nadu, Sri Lanka and Kerala, and falls in the month of "Kārttikai" (mid-November to mid-December) as per Tamil calendar.
Split into simpler sentences: The festival is observed in most Tamil homes and every Tamil temple of Tamil Nadu, Sri Lanka and Kerala. It falls in the month of "Kārttikai" (mid-November to mid-December) as per Tamil calendar.