Complex sentence: "The Bubble" was Hamm's final appearance as Drew on "30 Rock", though Hamm made an appearance on the show's fourth season episode "Anna Howard Shaw Day" that aired on February 11,2010.
Split into simpler sentences: The Bubble was Hamm's final appearance as Drew on "30 Rock". Though, Hamm made an appearance on the show's fourth season episode "Anna Howard Shaw Day" that aired on February 11,2010.