Complex sentence: Trams have operated continuously in Melbourne since 1884, with the opening of a horse tram line in Fairfield, since then they have become a distinctive part of Melbourne's character and feature in tourism and travel advertising.
Split into simpler sentences: Trams have operated continuously in Melbourne since 1884, with the opening of a horse tram line in Fairfield. Since then they have become a distinctive part of Melbourne's character and feature in tourism and travel advertising.