Complex sentence: Mother Boxes have sacrificed themselves for causes they have believed in and are greatly respected by the people of New Genesis, speaking of them as loving, living entitites in the shape of a small box worn much like a common day pager on Earth.
Split into simpler sentences: Mother Boxes have sacrificed themselves for causes they have believed in and are greatly respected by the people of New Genesis. In physical appearance they are in the shape of a small box worn much like a common day pager on Earth.