Complex sentence: At least 40 Catholic bishops are under surveillance, house arrest, detention, or have disappeared, and several leaders and members of underground Protestant churches have also been detained and sentenced to reeducation through labor or prison terms.
Split into simpler sentences: At least 40 Catholic bishops operate independent of official sanction, and some are under surveillance, house arrest, detention, or have disappeared. Several leaders and members of underground Protestant churches have also been detained and sentenced to reeducation through labor or prison terms.