Complex sentence: Though he refused the offer, Baraggan was forced to submit after Aizen easily killed many of his followers and bore a grudge against the Soul Reaper through his entire career as an Espada.
Split into simpler sentences: Though he refused the offer, Baraggan was forced to submit after Aizen easily killed many of his followers. He bore a grudge against the Soul Reaper throughout his entire career as an Espada.