for erect gait among our hairy ancestors to have become first the rule and in time a necessity presupposes that in the meantime the hands became more and more devoted to other functions.[2] even among the apes there already prevails a certain separation in the employment of the hands and feet.

How would the previous sentence be correctly capitalized?
For erect gait among our hairy ancestors to have become first the rule and in time a necessity presupposes that in the meantime the hands became more and more devoted to other functions.[2] Even among the apes there already prevails a certain separation in the employment of the hands and feet.