Complex sentence: Ottar Nicolai Grønvik (21 October 1916--15 May 2008) was a Norwegian philologist and runology scholar best known for his work on the runic alphabet and various runestones, especially the Tune Runestone, the Rök Runestone and the Eggjum stone.
Split into simpler sentences: Ottar Nicolai Grønvik (21 October 1916--15 May 2008) was a Norwegian philologist and runology scholar. He was best known for his work on the runic alphabet and various runestones, especially the Tune Runestone, the Rök Runestone and the Eggjum stone.