Original: According to the Finnesburg Fragment, the Danish prince Hnaef came with sixty followers to visit and spent the winter at the Finnburg, the fort of his brother-in-law Finn, king of the Frisians.
Simplified: According to the Finnesburg Fragment, the Danish prince Hnaef came with sixty followers to visit and spent the winter at the Finnburg. Finnburg was the fort of his brother-in-law Finn, king of the Frisians.