Complex sentence: He appeared in numerous episodes of "Doctor Who" in the early 1980s, often in uncredited roles.Marshman, Cyberman and Melkur in "The Keeper of Traken" and the last was as a Jacondan in "The Twin Dilemma".
Split into simpler sentences: He appeared in numerous episodes of "Doctor Who" in the early 1980s, often in uncredited roles. The first of these was as Melkur in "The Keeper of Traken" and the last was as a Jacondan in "The Twin Dilemma".