Complex sentence: Like many noble children of his time, Roger was betrothed young to Joan de Geneville, the wealthy daughter of Sir Piers de Geneville, of Trim Castle and Ludlow.
Split into simpler sentences: Like many noble children of his time, Roger was betrothed young. He was affianced to Joan de Geneville, the wealthy daughter of Sir Piers de Geneville, of Trim Castle and Ludlow.