Complex sentence: In 1885 Charles Ross discovered tin in the upper Annan River area (first Mount Amos, then Mounts Hartley, Leswell and Romeo), sluicing starting that year, with a small tin mining rush the following year.
Split into simpler sentences: In 1885 Charles Ross discovered tin in the upper Annan River area (first Mount Amos, then Mounts Hartley, Leswell and Romeo). Sluicing starting that year, with a small tin mining rush the following year.