Complex sentence: The area immediately surrounding Fortingall has one of the richest concentrations of prehistoric archaeological sites in Scotland, including Càrn na Marbh, a re-used bronze Age tumulus, that was used as a burial ground in the 14th century, and a focus for the villages Samhain festival.
Split into simpler sentences: The area immediately surrounding Fortingall has one of the richest concentrations of prehistoric archaeological sites in Scotland. Fortingall also has'Carn na Marbh' a re-used bronze Age tumulus, that was used as a burial ground in the 14th century, and a focus for the villages Samhain festival.