Complex sentence: As they travel, the police learn that the old church has gone up in flames, and all evidence of any bodies has been destroyed, they are then attacked and killed by the mysterious driver, who loads the policemen's bodies into his truck.
Split into simpler sentences: As they travel, the police learn that the old church has gone up in flames, and all evidence of any bodies has been destroyed. They are then attacked and killed by the mysterious driver, who loads the policemen's bodies into his truck.