Complex sentence: The series, which consisted of six one-hour episodes, premiered on ABC3 on 23 April 2016, and covered roughly the events of the first novel, "Tomorrow, When the War Began".
Split into simpler sentences: The series, which consisted of six one-hour episodes, premiered on ABC3 on 23 April 2016. The first series covered roughly the events of the first novel, "Tomorrow, When the War Began".