Complex sentence: Blizzard released their first of five animated shorts, "Recall", in March 2016; while the PlayOverwatch YouTube channel uploaded the short on March 23, the Xbox YouTube channel premiered it on March 21.
Split into simpler sentences: Blizzard released their first of five animated shorts, "Recall", in March 2016. While the PlayOverwatch YouTube channel uploaded the short on March 23, the Xbox YouTube channel premiered it on March 21.