Complex sentence: The feed is placed in the motor and the motor is rotated, the pestle also rotated due to friction produce between the motor and pestle, scrapper is bring the feed to grinding zone, and the material is size reduction which is collected and sieved.
Split into simpler sentences: The feed is placed in the motor and the motor is rotated. Scrapers bring the feed to the grinding zone, and the material is reduced in size and the collected and sieved.