Complex sentence: Upstairs, Paul discovers the killers had been hiding in the house before the family arrived, but his throat is slashed by Fox Mask, as it is revealed that Zee and Felix hired the killers so as to inherit the family fortune.
Split into simpler sentences: Upstairs, Paul discovers that the killers had been hiding in the house before the family arrived, but his throat is slashed by Fox Mask. It is revealed that Zee and Felix hired the killers so as to inherit the family fortune.