What is the version of the following sentence with correct punctuation?

The reason for this is because terrestrial human beings are in their evolutionary spiral on more or less the same evolutionary step as the Earth being is in its spiral that is to say in a transitional stage from animal to human being
The reason for this is because terrestrial human beings are, in their evolutionary spiral, on more or less the same evolutionary step as the Earth being is in its spiral, that is to say in a transitional stage from animal to human being.