Complex sentence: Eventually they reconcile and start dating, though their relationship is on and off after Oliver saves his life in "Salvation", he gains an active interest in the vigilante known as the Hood and wants to emulate him.
Split into simpler sentences: Eventually they reconcile and start dating, though their relationship is on and off. After Oliver saves his life in "Salvation", he gains an active interest in the vigilante known as the Hood and wants to emulate him.