Complex sentence: Alice hates her father for cutting her out of her inheritance, therefore Danny assumes that she will be happy with his plan, though she is not informed about the plan as she has to be genuinely frightened, otherwise Vic would become suspicious.
Split into simpler sentences: Alice hates her father for cutting her out of her inheritance. Therefore, Danny assumes that she will be happy with his plan, though she is not informed about the plan as she has to be genuinely frightened, otherwise Vic would become suspicious.