Complex sentence: In 1989, the Sagano Line was rerouted between the present day Saga Arashiyama Station to Umahori to accommodate dual tracks and electrification, but the old route, which ran along the Hozu River, had been popular with tourists.
Split into simpler sentences: In 1989, the Sanin Main Line was rerouted between the present day Saga-Arashiyama Station to Umahori to accommodate track duplication and electrification. However the old route which ran along the Hozu River, had been popular with tourists.