Army of Darkness, the third Evil Dead movie directed by Sam Raimi, was released six years after Evil Dead II, but its troubled and lengthy production cycle meant that it actually took over a decade for the film to be completed. Initially titled The Medieval Dead, according to Bruce Campbell in Medieval Times, a documentary about the making of the movie, Army of Darkness transports Ash Williams (Bruce Campbell) to the Middle Ages for a Jason and the Argonauts-inspired adventure. Tonally, Army of Darkness jettisons what little horror remained in the series following requel Evil Dead II in favor of a comedic tribute to classic "sword and sorcery" tales.

https://screenrant.com/evil-dead-army-of-darkness-delay-explained/