Complex sentence: In one notable instance, Japanese police herded the inhabitants of the village of Jeam-ri into a locked church before burning it to the ground, even shoting through the burning windows to ensure that no one made it out alive.
Split into simpler sentences: In one notable instance, Japanese police in the village of Jeam-ri herded everyone into a church, locked it, and burned it to the ground. They even shot through the burning windows of the church to ensure that no one made it out alive.