Complex sentence: When Nessa assumes the title of Eminent Thropp, Frex moves with her to the stately mansion of Colwen Grounds, and sends a letter to Elphaba asking her to come and help her sister deal with the pressures of government.
Split into simpler sentences: When Nessa assumes the title of Eminent Thropp, Frex moves with her to the stately mansion of Colwen Grounds. He sends a letter to Elphaba asking her to come and help her sister deal with the pressures of government.