Complex sentence: In season 5, Debbie moves to Dunk Island to work as a waitress, and is replaced with new character Samantha Kelly (Sam), a niece of Martin's from Hong Kong, who promptly moves in with the Kellys.
Split into simpler sentences: In season 5, Debbie moves to Dunk Island to work as a waitress. She is replaced with new character Samantha Kelly (Sam), a niece of Martin's from Hong Kong who moves in with the Kellys.