Complex sentence: He was one of the pioneers of the romantic movement in Assamese literature and popularly known in Assamese literary society as Upanyash Samrat (king of novel) as he laid the foundation of Assamese fictional literature.
Split into simpler sentences: He was one of the pioneers of the romantic movement in Assamese literature. He is popularly known in Assamese literary society as Upanyash Samrat (king of novel) as he laid the foundation of Assamese fictional literature.