Complex sentence: In later works her name is Morgause she is the daughter of Igraine by her first husband, Gorlois, and she becomes pregnant with Mordred after sleeping with Arthur while they were unaware of their relation.
Split into simpler sentences: In later works her name is Morgause, and she is the daughter of Igraine by her first husband, Gorlois. Morgause becomes pregnant with Mordred after sleeping with Arthur while they were unaware of their relation.