Complex sentence: The show's producers had several weeks notice the series was ending, allowing them to craft suitable storylines leading to a strong conclusion, one which involved the final defeat of the villainous Joan "The Freak" Ferguson.
Split into simpler sentences: The show's producers had several weeks' notice that the series was ending. This allowed them to craft suitable storylines which led to a strong conclusion including one which involved the final defeat of the villainous Joan "The Freak" Ferguson.