one principle asserts that social work clients have the right to hold and express their own opinions and to act on them, as long as doing so does not infringe on the rights of others.
이 문장에서, 밑줄 친 부분이 어떻게 되어있는지 모르겠어요,

doing so does not infringe 되어있는데, 다른 사람들의 권리를 침하하지 않는한.. 그러면,, doing so does~ 이건 왜 쓰인 건가요?

답변 부탁드립니다.