Complex sentence: Nemo tries to project a stern, controlled confidence, but he is driven by a thirst for vengeance and a hatred of imperialism (particularly the British Empire) and wracked by remorse over the deaths of his crew members and even by the deaths of enemy sailors.
Split into simpler sentences: Nemo tries to project a stern, controlled confidence, but he is driven by a thirst for vengeance and a hatred of imperialism (particularly the British Empire). He is also wracked by remorse over the deaths of his crew members and even by the deaths of enemy sailors.