Complex sentence: So Kottarakkara Thampuran initiated a parallel mode of entertainment, which he called Ramanattam which was later transformed into Aattakatha, and yet later into Kathakali while Krishnanattam based on the story of Lord Krishna's activities, Ramanaattam described the complete story of Lord Raman.
Split into simpler sentences: So Kottarakkara Thampuran initiated a parallel mode of entertainment, which he called Ramanattam which was later transformed into Aattakatha, and yet later into Kathakali. While Krishnanattam is based on the stories of Lord Krishna's activities, Ramanaattam described the complete story of Lord Raman.