Complex sentence: This stone passage tomb is often misunderstood to have been a chair, as is often told in local history, however excavations have found it to have been a passage tomb similar to that of Newgrange found in Boyne Valley.
Split into simpler sentences: This stone passage tomb is often misunderstood to have been a chair, as is often told in local history. However, excavations have found it to have been a passage tomb similar to that of Newgrange found in Boyne Valley.