Complex sentence: As the codes are pseudorandom and selected in such a way as to cause minimal interference to one another (orthogonality), multiple users can talk at the same time causing added noise forcing all users to speak a little bit louder (i.e. use more power).
Split into simpler sentences: As the codes are pseudorandom and selected in such a way as to cause minimal interference to one another (orthogonality), multiple users can talk at the same time. This causes a little bit of added noise forcing all users to speak a little bit louder (i.e. use more power).