Complex sentence: On December 12,2014, it was announced the series will run in two "split cours" (quarters of the year) in 2015 from April to June and then from October to December with 12 episodes each.
Split into simpler sentences: On December 12,2014, it was announced the series will run in two "split cours" (quarters of the year). The first would air in 2015 from April to June and the second from October to December, with both cours having 12 episodes each.