Complex sentence: At this time, William Killick (Cillian Murphy), a British Army officer smitten with Vera, pursues her; both Vera and Caitlin are intrigued by his steadfast, gallant personality, although it contrasts with Vera's rebelliousness.
Split into simpler sentences: At this time, William Killick (Cillian Murphy), a British Army officer pursues Vera. Both Vera and Caitlin are intrigued by his steadfast, gallant personality, despite it's contrasts with Vera's rebelliousness.