Complex sentence: On February 13,2015, FOX released the first teaser trailer for the series on YouTube; a following teaser on March 13, featuring Roberts, and another that aired during the first season finale of "Empire", featuring Palmer.
Split into simpler sentences: On February 13,2015, FOX released the first teaser trailer for the series on YouTube;. A teaser followed on March 13, featuring Roberts,, and another aired during the first season finale of "Empire", featuring Palmer.