Complex sentence: The draug is a sinister, malevolent being of Nordic origin, often linked to legends of the Icelandic draugr, that is often identified with the spirits of mariners drowned at sea.
Split into simpler sentences: The draug is a sinister, malevolent being of Nordic origin, often linked to legends of the Icelandic draugr. In more recent folklore, the Draug is often identified with the spirits of mariners drowned at sea.