Complex sentence: It should be noted that the opening theme tune on the original BBC2 transmission was the same as the music over the closing credits, whereas the opening theme on the Region 2 DVD version is a series of abstract sounds, while the closing music remains intact.
Split into simpler sentences: It should be noted that the opening theme tune on the original BBC2 transmission was the same as the music over the closing credits. The opening theme on the Region 2 DVD version is a series of abstract sounds, while the closing music remains intact.