Complex sentence: The last episode of the series also features Rowan Atkinson in the role of Blackadder's Scottish cousin MacAdder, supposedly a fierce swordsman; this leads to a dialogue in which Atkinson is acting both parts.
Split into simpler sentences: The last episode of the series also features Rowan Atkinson in the role of Blackadder's Scottish cousin MacAdder, supposedly a fierce swordsman. Interestingly enough, this leads to a dialogue in which Atkinson is acting both parts.