Complex sentence: The appearance changed yet again when the current weir was constructed between 1968 and 1972 as part of a flood prevention scheme, and was used as a location for the filming of Javert's suicide in the film version of "Les Misérables".
Split into simpler sentences: The appearance changed yet again when the current weir was constructed between 1968 and 1972 as part of a flood prevention scheme. The weir was used as a location for the filming of Javert's suicide in the film version of "Les Misérables".