Complex sentence: Bishop Zen visited the protestors at 11 p.m. and openly criticised the action of the police as "the shame of Hong Kong" because he was not allowed to visit the Roman Catholics detained by the police.
Split into simpler sentences: Bishop Zen visited the protestors at 11 p.m. and openly criticised the action of the police as "the shame of Hong Kong". However the bishop was not allowed to visit the Roman Catholics detained by the police.