Complex sentence: The interesting thing about the scaphoid bone is that is has a retrograde blood supply, meaning that the blood flow comes from a small vessel that enters the most distant part of the bone and flows back through the bone to give nutrition to the bone cells.
Split into simpler sentences: The interesting thing about the scaphoid bone is that is has a retrograde blood supply. This means that the blood flow comes from a small vessel that enters the most distant part of the bone and flows back through the bone to give nutrition to the bone cells.