Complex sentence: Candy, O'Hara, and Ramis dropped out of the show at this juncture; added to the cast (and writing room) were Tony Rosato, Robin Duke, and Rick Moranis.
Split into simpler sentences: Candy, O'Hara, and Ramis dropped out at this juncture. Added to the cast (and writing room) were Tony Rosato, Robin Duke, and Rick Moranis.