Complex sentence: The book begins two years after the events of The Amulet of Samarkand with Nathaniel, apprenticed to the Minister of Security, (Jessica Whitwell) and working as an understudy to the Minister of Internal Affairs, Julius Tallow.
Split into simpler sentences: The book begins two years after the events of The Amulet of Samarkand. Nathaniel is apprenticed to the Minister of Security, Jessica Whitwell; and is working as an understudy to the Minister of Internal Affairs, Julius Tallow.