Complex sentence: A people counter is a device used to measure the number and direction of people traversing a certain passage or entrance per unhi jzgdie is often used at the entrance of a building so that the total number of visitors can be recorded.
Split into simpler sentences: A people counter is a device used to measure the number and direction of people traversing a certain passage or entrance per unit time. The device is often used at the entrance of a building so that the total number of visitors can be recorded.