Complex sentence: At the Luthor Mansion, Tess Mercer (Cassidy Freeman) is confronted by Granny Goodness, who offers her one final chance to join Darkseid's forces to spare her life during the coming destruction.
Split into simpler sentences: At the Luthor Mansion, Tess Mercer (Cassidy Freeman) is confronted by Granny Goodness. Granny offers her one final chance to join Darkseid's forces, so that her life may be spared during the coming destruction.