Complex sentence: It filled out its soccer ranks by attracting three schools from the Mountain Pacific Sports Federation, one of which is departing full WAC member San Jose State, whose new conference (the Mountain West) does not sponsor the sport.
Split into simpler sentences: It filled out its soccer ranks by attracting three schools from the Mountain Pacific Sports Federation. One of those three is departing full member San Jose State, whose new conference (the Mountain West) does not sponsor the sport.