Complex sentence: According to Robinson, when Ray met Shankar, the later hummed a tune which was folk-based but had "certain sophistication"; the tune, usually played on a bamboo flute, became the main theme of the film.
Split into simpler sentences: According to Robinson, when Ray met Shankar the latter hummed a tune which was folk-based but had "a certain sophistication". The tune, usually played on a bamboo flute, became the main theme for the film.