Complex sentence: At Mars Investigations, Keith is hired by Celeste Kane (Lisa Thornhill), who despite her contempt for both Keith and Veronica, wants him to ascertain if her husband is having an affair.
Split into simpler sentences: At Mars Investigations, Keith is engaged by Celeste Kane (Lisa Thornhill). Despite her contempt for both Keith and Veronica, she wants Keith to ascertain if her husband is having an affair.