Complex sentence: When King Tribhuvan fled from Nepal to India in 1950, he travelled through Butwal, then little more than a village on the western bank of Tilottama River (also popularly known as Tinau River).
Split into simpler sentences: When King Tribhuvan fled from Nepal to India in 1950, he travelled through Butwal. At that time Butwal was little more than a village on the western bank of Tilottama River (also popularly known as Tinau River).