Complex sentence: He returned to acting with a role in the television production "Centennial" (1978), and was a special guest as a past award winner at both the 1998 and 2003 Academy Awards Ceremonies.
Split into simpler sentences: He returned to acting with a role on an episode of the television production "Centennial" (1978). Jarman was a special guest as a past award winner at both the 1998 and 2003 Academy Awards Ceremonies.