Mr. Jaggers invites Pip into his office and, after grilling him for a while, tells Pip that he's getting a gigantic birthday present. From now on, Pip will receive an allowance of 500 pounds a year. That's a lot of money. Pip is psyched, but he really wants to know who his benefactor is.
The first sentence about Siamese cats is correct because the hypens are correctly placed where you pause when reading. The other answers have misplaced the hypens and they aren't in the appropriate place for pausing.
