Complex sentence: A fourth television series, titled was announced on February 25,2017 as a climax to the series, and started airing on July 14,2017, consisting of 6 new episodes, and 6'reminiscence' episodes.
Split into simpler sentences: A fourth television series, titled was announced on February 25,2017 and is scheduled to air from July 14,2017. The fourth anime installment will feature 6 new episodes, and 6'reminiscence' episodes.