Complex sentence: Despite the warden's attempts to steer Frank away, he soon discovers that Emily Thorne is actually the name of Amanda's former cellmate in jail, the two later exchanged names so Amanda/Emily could seek revenge for those who wronged her father.
Split into simpler sentences: Despite the warden's attempts to steer Frank away, he soon discovers that "Emily Thorne" is actually the name of Amanda's former cellmate in jail. The two later exchanged names so Amanda/Emily could seek revenge for those who wronged her father.