Complex sentence: Nine months later and Guilda is walking across Haarlem with her serving men to attend the New Year's eve service, when she witnesses three foreign adventurers intervening on behalf of a Spanish woman being attacked by a mob by the Postern gate.
Split into simpler sentences: Nine months later and Guilda is walking across Haarlem, with her serving men, to the New Year's eve service. On route she witnesses three foreign adventurers intervening on behalf of a Spanish woman, who is being attacked by a mob by the Postern gate.