It then became possbile for universities to use the system a

这个是it becomes(is) possbile for sb.to do sth.的句型,it 做形式主语,真正的主语是后面的to do sth.
It（形式主语） then(时间状语) became（系动词） possbile（表语） for universities to use the system as well（后面的是真正的主语,as well 表示“也”）