Simplify the following text for a Grade 10 native English-speaking person.
Original: The producers have also confirmed that Harold Perrineau and Cynthia Watros , who portray Michael Dawson and Libby Smith , respectively , returned in the second half of the season .
Simplified: Harold Perrineau and Cynthia Watros , who portray Michael Dawson and Libby Smith , respectively , return in the second half of the season .