Complex sentence: An anime adaptation, directed by Itsuki Imazaki, was originally teased as an April Fools' Day joke, but Imazaki later confirmed that production had begun and he was working on storyboards for the series.
Split into simpler sentences: An anime adaptation, directed by Itsuki Imazaki, was originally teased as an April Fools' Day joke but later confirmed to actually be happening. Imazaki confirmed that production had begun and he was working on storyboards for the series.