Complex sentence: Two episodes later, in episode 17 (Season 1, Episode 17) Rosalee creates another potion which clears the last of the Zaubertrank effects, no after effects are shown and he has no memory of what he had been doing.
Split into simpler sentences: Two episodes later, in episode 17 (season 1, episode 17) Rosalee creates another potion which clears the last of the zaubertrank effects. No after effects are shown and he has no memory of what he had been doing.