Complex sentence: In 2003, four surviving cast members (Griffith, Howard, Knotts, and Nabors) shot a reunion special which featured the actors reminiscing about their time on the show, interspersed with archival footage and short filmed interviews with some of the other surviving cast members.
Split into simpler sentences: In 2003, four surviving cast members (Griffith, Howard, Knotts, and Nabors) came together for a reunion special that featured the actors reminiscing about their time on the show. The production was interspersed with archival footage and short filmed interviews with some of the other surviving cast members.