Complex sentence: In 2002, Howerton starred as Corey Howard in the ill-fated "That' 80s Show", and a year later went on to guest star on "ER" as Dr. Nick Cooper in 2003.
Split into simpler sentences: In 2002, Howerton starred as Corey Howard in the ill-fated "That' 80s Show". He went on to guest star on "ER" as Dr. Nick Cooper in 2003.