Their measure of complexity is Genome size. That's a very simple measure of complexity. Just a dumb example-- humans have a single gene for a protein in muscl

Their measure of complexity is Genome size. That's a very simple measure of complexity. Just a dumb example-- humans have a single gene for a protein in muscles. But that single genes has multiple exons and depending on whether it's being produced in heart, usual muscles, or soft-tissue muscle it's transcribed differently. Most of the protein is re-used, but a couple of parts are swapped out. So we have genetic code being used in three different proteins. Our genome is being efficient in size, yet it's increasing in complexity. That being said, I have no idea how to measure complexity well.