Complex sentence: Our brains ability to recognize change in a visual velocity, is one of the keys to "feeling" velocity, but it's important that "feeling" is only the distinguishing of one velocity, in comparison to another.
Split into simpler sentences: Our brains ability to recognize change in a visual velocity, is one of the keys to "feeling" velocity. It's important to remember that "feeling" is only the distinguishing of one velocity, in comparison to another.