Complex sentence: Smelling salts have been in use since Roman times, and are mentioned in the writings of Pliny as'Hammonicus sal', and further evidence exists of the use in the 13th century by alchemists as'sal ammoniac'.
Split into simpler sentences: Smelling salts have been used since Roman times, and are mentioned in the writings of Pliny as'Hammonicus sal',. Evidence exists of use in the 13th century by alchemists as'sal ammoniac'.