Complex sentence: Despite his best efforts he starts to have genuine feelings for Cara, but the resultant confusion and conflicting emotions over his hatred of Crosses ultimately prove too much and he ends up beating her to death and taking all her money.
Split into simpler sentences: Despite his best efforts he starts to have genuine feelings for Cara, but the resultant confusion and conflicting emotions over his hatred of Crosses ultimately prove too much and he follows through with his original plan. He ends up beating her to death and taking all her money.