Complex sentence: Various festivals are held across India, and abroad, which mainly consist of Carnatic music performances, including the Madras Music Season held in Chennai from December to January each year, which has been considered amongst the world's largest cultural events.
Split into simpler sentences: Various festivals are held across India, and abroad, which mainly consist of Carnatic music performances. The Madras Music Season, a festival held in Chennai from December to January each year, has been considered amongst the world's largest cultural events.