Complex sentence: The liver is not related to liver spots physiologically, but it does have a similar color, however it was once believed that liver spots were a sign of a malfunctioning liver, this has since been disproved.
Split into simpler sentences: The liver is not related to liver spots physiologically, but it does have a similar color. It was once believed that liver spots were a sign of a malfunctioning liver, however this has since been disproved.