Complex sentence: Similarly, the site at Forteviot, in Perthshire produced a unique warrior burial under a giant sandstone slab engraved with a spiral and an axehead, pecked into the underside.
Split into simpler sentences: Similarly, the site at Forteviot, in Perthshire, produced a unique warrior burial under a giant sandstone slab. The slab is engraved with a spiral and has an axehead pecked into the underside.