Complex sentence: She also worked with the team that mapped the cream gene, which is a dilution gene with no deleterious effects, but at one time, there was a misconception that cream colors might be linked to lethal white syndrome.
Split into simpler sentences: She also worked with the team that mapped the cream gene, which is a dilution gene with no deleterious effects. At one time, there was a misconception that cream colors might be linked to lethal white syndrome.