Complex sentence: Meanwhile, Derk is convalescing bak at Derkholm/The Dark Citadel, and his wife Mara seems to be on the brink of leaving him, and is enjoying the part of the Glamourous Enchantress rather too much.
Split into simpler sentences: Meanwhile, Derk is convalescing back at Derkholm/The Dark Citadel. His wife Mara seems to be on the brink of leaving him, and is enjoying the part of the Glamorous Enchantress rather too much.