Complex sentence: Later, Mohiam accompanies Emperor Shaddam Corrino IV to Arrakis in her role as Imperial Truthsayer; there she is faced with Paul's four-year-old sister, the pre-born Alia, whom she calls an Abomination.
Split into simpler sentences: Later, Mohiam accompanies Emperor Shaddam Corrino IV to Arrakis in her role as Imperial Truthsayer. She also confronts Paul's four-year-old sister, the pre-born Alia, calling her an Abomination.