original: The corpses were often left decaying for months.
simplifications: The dead bodies were often left to decompose for months. The dead bodies were often left rotting for months. The corpses were left for months. This led to decay. The bodies often rotted for months. The dead bodies were often left to decay for months. The corpses decayed for months. The dead bodies were often left to rot for months. Often, the corpses were decaying for months. The corpses often decayed for months. The dead bodies were left rotting for months.