Complex sentence: Sigurðr (disguised as Gunnar) and claimed Brynhildr's hand, and they stayed there three nights, but Sigurðr laid his sword between them (meaning that he did not take her virginity before giving her to the real Gunnar).
Split into simpler sentences: Sigurðr (disguised as Gunnar) claimed Brynhildr's hand, and they stayed there three nights. However, Sigurðr laid his sword between them (meaning that he did not take her virginity before giving her to the real Gunnar).