Complex sentence: One of the French ships taken was the 80-gun "Neptune", which had fought at Trafalgar; the Spanish took her into their service, renaming her "Neptuno" as a replacement for the ship lost in 1805.
Split into simpler sentences: One of the French ships taken was the 80-gun "Neptune", which had fought at Trafalgar. The Spanish took her into their service, renaming her "Neptuno" as a replacement for the ship lost in 1805.